Narco-satanists and the Murder of Mark Kilroy

3/18/2023

In March 1989, Mark Kilroy, a promising pre-med student from Texas, vanished from the neon-drenched streets of Matamoros, Mexico, just across from Brownsville. What authorities eventually unearthed on a desolate ranch outside town unleashed a nightmare of black magic, cartel power, and human sacrifice that still whispers through true crime lore to this day. Books, documentaries, and lingering questions followed—many that have never been answered. For those who live along this blood-soaked frontier, the name Kilroy and the devil’s ranch refuse to fade into the past.

Bodies unearthed at ranch in Matamoros c.1989

Matamoros has always lured the desperate and the reckless. Three international bridges connect it to Brownsville, Texas, offering cheap thrills and darker opportunities. Its sinister reputation stretches back decades, brutally claiming tourists and locals alike. Yet nothing prepared the world for the evil that slithered into the light in April 1989.

The multitude of shallow graves unearthed on a ranch on the border of the United States laid bare a horrific organization that practiced ritual animal and human sacrifice. At the center of it was a man named Adolfo de Jesús Constanzo, a Cuban-American known as “El Padrino de Matamoros” (The Godfather of Matamoros), who reigned as the charismatic high priest of this narco-satanic cult. Constanzo had steeped himself since childhood in the African-derived traditions of Palo Mayombe and Abakua, practices his mother and stepfather embraced with grotesque fervor.

Victims being unearthed in Matamoros ranch c.1989

The Godfather of the Narco-Satanists

Constanzo was born to Delia Aurora Gonzalez del Valle on November 1, 1964. The teenage Cuban immigrant went on to have two more children with different fathers. Constanzo's father died when he was an infant (or so it was said). His mother moved with her family to Puerto Rico, where she remarried.

Constanzo was baptized as a Catholic and served as an altar boy, but this masked a deep well of darkness that his mother immersed him in. He would accompany her on trips to Haiti, where he learned about voodoo and palo mayombe.

In 1972, the family returned to Miami. His stepfather died the following year, and 10-year-old Constanzo apprenticed to a Palo Mayombe priest in Little Havana, where the family lived. In compliance with this evil religion, his mother forced him to torture and kill animals, praising his growing cruelty. At one point, his mother was arrested for keeping 27 animals in her tiny apartment; the floors were covered in feces and blood.

Constanzo's mother remarried in March 1977 to Marcos A. Gonzalez, a drug runner and fervent follower of santeria and palo mayombe. In his teens, Constanzo continued his tutelage with a Haitian voodoo priest. He also cruised the gay clubs and committed petty crime. After graduating from high school with poor grades, he spent one semester at a junior college before leaving.

By age 21, he had become a full-fledged palero, pledging himself to Kadiempembe—the devil of the religion. In 1981, he flew several times to Mexico, and in 1983, he left Miami and opened a shop in Mexico City’s Zona Rosa, known for being welcoming to gays like Constanzo. He recruited Martin Quintana Rodriguez, Omar Orea Ochoa, and Jorge Montes. He also began a sexual relationship with both Quintana and Ochoa

He derived his main income from the various rituals he performed as a palero for wealthy clients, including drug lords and corrupt police officials. Some of them involved animal sacrifices said to give their clients good luck, using both locally available animals like goats and chickens as well as exotic ones like zebras and lion cubs. In exchange for protection spells that supposedly rendered them invisible to the law, the cartels paid him handsomely. In 1985, they apparently escalated to using human remains in rituals, obtaining them by raiding a local graveyard.

The practice was so lucrative that Constanzo bought a $60K condominium in Mexico City and several luxury cars. He recruited four members of the Federal Judicial Police to protect his clients, thus convincing them that he was a powerful palero.

Florentino Ventura

Florentino Ventura: The Tiger’s Bloody Fall

Among the many dark figures circling Adolfo Constanzo’s narco-satanic empire, none burned brighter—or fell more violently—than Florentino Ventura, the infamous head of Interpol in Mexico. Known as “El Tigre,” Ventura cultivated a fearsome reputation as a relentless crime fighter who was every bit as cruel and efficient as the cartel killers he hunted. Vain and extravagant, he lived far beyond his official salary, dyed his hair jet black, and underwent cosmetic surgery to keep pace with his much younger wife. Yet beneath the polished exterior lurked a soul already half-claimed by the shadows he pretended to battle.

Ventura’s personal life spiraled deeper into darkness. His first wife reportedly killed herself in their new home in 1981, though many whispered that El Tigre had hanged her after their marriage collapsed under the weight of his affair with Maria Cira Villanueva. Villanueva, twenty-five years his junior and the first woman to serve in the Federal Judicial Police, became his second wife in 1984. Their union was stormy, marked by jealousy and violence.

On September 17, 1987, the darkness finally consumed him. While out drinking with his wife, her childhood friend Olga Trevino, and Olga’s husband Elias Orozco Salazar, Ventura demanded to drive to another bar. When Maria Cira refused and took the wheel of their Grand Marquis, he ripped out the keys. In the ensuing chaos, Ventura drew his .45 caliber pistol. He shot his wife three times in the head, then killed Olga. Before the lone survivor could intervene, El Tigre put the gun in his own mouth and pulled the trigger.

The murder-suicide sent shockwaves through law enforcement and the underworld alike. Some saw it as the inevitable price of playing both sides—serving the cartels while pretending to hunt them, dabbling in the occult currents that swirled around Constanzo’s rituals. Others whispered of supernatural retribution: that the same demonic forces El Tigre had helped unleash through his introduction of Constanzo had finally turned on him, dragging the Tiger down into the abyss he had fed for years.

In death, Ventura became yet another grim chapter in the Matamoros horror—a symbol of how deeply the narco-satanic corruption had infected even the highest ranks of Mexican justice. His violent end served as an eerie prelude to the full exposure of the Devil’s Ranch and the blood-soaked altars that followed.

Slaughter of the Calzada family tied into black magic and drug deal vengeance c.1987

The Calzada Massacre: Vengeance and Black Magic

Ventura had served as the crucial bridge between Constanzo and the powerful Calzada cartel. In 1986, he personally introduced “El Padrino” to the family, opening the door for the occultist to offer his sinister services—protection spells, invisibility rites, and Palo Mayombe ceremonies—in exchange for vast sums of money and growing influence within the organization.

Emboldened, Constanzo soon demanded full partnership in the Calzada cartel’s operations. When the family rejected his offer, a dark shadow fell over them.

On April 30, 1987—on the eve of Beltane, the ancient halfway point between the spring equinox and summer solstice, a date long associated with fire sacrifices to Moloch (also known as Ba’al, Nimrod, and Saturn)—seven people gathered at F.M. Asociados, a fire extinguisher maintenance firm housed in an old building at 27 Barcelona Street in Mexico City.

Among them were the company owners José Rolón and Arturo Sánchez Calzada, secretary Celia Klein, driver Federico de la Vega, Sánchez’s wife Rosalía, his mother María, and 17-year-old family maid Gabriela Mondragón. Cocaine and weighing scales littered the premises. Many of the fire extinguishers serviced at the shop traveled north toward the border, raising suspicions that they had been repurposed as smuggling containers for cocaine destined for the United States.

The group had assembled for a traditional “cleansing” ritual meant to ward off evil spirits—a common practice in Mexico. Investigators later found eggs, garlic, red ribbon, and two crucifixes at the scene.

A month after the disappearance of Calzada and his family, the bodies of three men and four women were pulled from the Grand Canal main sewage canal that flows north into the Tula River. This was the same place where the bodies of 11 Colombian bank robbers and a Mexican taxi driver were dumped in 1981 after being tortured. The bodies were mutilated and weighed down. All seven were bound, gagged, and stabbed numerous times with a double-edged instrument.

Police believe the killers shot and stabbed de la Vega immediately. They then abducted the others in the company van and took them elsewhere for slaughter. Five of the victims were gutted, their fingertips sliced off in a gruesome attempt to delay identification. In one case, the spine had been removed. De la Vega’s index finger was later discovered in one of Sánchez’s cars, wrapped in part of a $100 bill and sealed with adhesive tape bearing the letters “DEA.” There were indications of a "black mass" or Palo Mayombe ceremony at the offices

Only the bodies of de la Vega, Klein, and Mondragón were eventually claimed by relatives. The remains believed to be those of Sánchez, his wife, his mother, and an unidentified man lingered in the morgue for more than two weeks. Police suspected Rolón had also been killed, yet his body was never recovered.

The Calzada massacre carried the unmistakable stench of ritual vengeance. Constanzo’s rejected demand for power, combined with the dark arts he peddled, had unleashed a wave of supernatural-tinged brutality that left the underworld trembling. The lines between cartel warfare and demonic sacrifice had blurred beyond recognition.

Abakua ritual cauldron found at Matamoros c.1989

In 1987, soon after the annihilation of the Calzada family, Constanzo recruited Sara María Aldrete Villarreal, whom he nicknamed "La Madrina" (Spanish for "the godmother") and appointed as high priestess of the cult. She was a tall, striking Matamoros native and an honor student and cheerleader at Texas Southmost College. Most importantly, she was Gilberto Sosa's girlfriend. Sosa was a drug dealer linked to the Hernandez clan, to which Constanzo wanted an introduction.

She served as the group’s priestess. Together with Constanzo, she drew twisted inspiration from the 1987 film The Believers, which depicted child sacrifice for money and power through Palo Mayombe rites. Aldrete went on to become the main recruiter for the cult.

Rolling Stone magazine wrote: [There is]…a story making the rounds that tells of the night Aldrete persuaded three male friends to screen a video of The Believers. After the film say the students, Aldrete stood up and began to preach in strange tones about the occult. ‘They had been drinking and they just thought she was trying to be spooky,’ says one student who knows the boys, ‘but they look back on it now and think she must have been serious

Adolfo Costanzo, head of a narco-satanist cult

In 1988, Constanzo took over a ranch in the Mexican desert owned by the Hernandez brothers. It was very close to Brownsville, Texas, and the American border. It earned the moniker as the Devil's Ranch since it became the cult’s unholy altar—a strategic waypoint for drug smuggling just miles from the U.S. border. There, Constanzo and his followers conducted blood rituals before major deals, slaughtering victims to ensure success and supernatural protection. They kidnapped some off the streets; others were rival dealers. These disappearances went under the radar.

During this time, Costanzo crossed the international bridge to Brownsville and checked in at a hotel, often the Brownsville Holiday Inn, where he partied with Aldrete and members of the Hernandez gang.

The beginning of the end started on March 13, 1989, when Constanzo ordered a human sacrifice to ensure safe passage for 800 kilos of marijuana. This was a stranger like those whose remains lay littered across the ranch. The 13th date was not chosen randomly; however, Constanzo never imagined how unlucky that number would turn out to be for him.

Since suffering is an essential ingredient of dark sacrifices, Costanzo believed the first victim had not suffered enough. He wanted another and gave his followers a checklist to follow. Mark Kilroy, however, was chosen with deliberate evil intent: a clean-cut, intelligent, White, Anglo-American pre-med student—an ideal “pure” sacrifice. The reason for this choice was that Constanzo wanted to absorb the intelligence of this sacrifice.

Kilroy had crossed the border during spring break, never to return. His frantic parents hounded both U.S. and Mexican authorities, and his face appeared on America’s Most Wanted. The search accidentally cracked open a far larger abyss.

Under pressure from Mexican politicians, the Matamoros police only arrested four of Constanzo's followers. However, the unlucky number 13 struck again on April 1, when Serafin Hernandez Garcia, a drug dealer and associate of Constanzo, sped through a police checkpoint. He believed the invisibility charm Constanzo sold him actually worked. Police chased him to Rancho Santa Elena. A preliminary search turned up drugs and weapons stored for the cartel. Police also arrested David Serna Valdez, another drug dealer.

Hernandez confessed to kidnapping and killing Mark Kilroy, as well as assisting in the murders of 14 other people. He walked the police through the property, taking them where 15 bodies were buried (other reports said there were at least 25). One of the bodies belonged to Mark Kilroy.

Reward leaflet for Mark Kilroy c.1989

Kilroy’s death was monstrous. Cult members raped and killed him with a machete. They severed the top of his skull, removed and boiled his brain with a roasted turtle, hacked off his legs below the knees, and threaded wire through his spine to fashion a necklace from his vertebrae for Constanzo. His mutilated remains were dumped into a shallow grave to rot.

Additionally, Constanzo, as one final security measure for the marijuana shipment, killed another victim named Gilberto Sosa.

Other victims suffered decapitation, castration, burning, skinning alive, and heart removal. A 55-gallon drum boiled flesh from bones. In one cauldron, investigators found human remains mingled with a goat’s head. The air reeked of blood, decay, and dark incense. They bore the unmistakable marks of Palo Mayombe and darker rites.

Carlos Tampia, Chief Deputy of Cameron County, Texas, said, "I thought in my twenty-two years of law enforcement I had seen everything. I hadn't. As we drew near, you could smell the stench... blood and decomposing organs. In a big, cast-iron pot, there were pieces of human bodies and a goat's head with horns."

Not long before Kilroy was kidnapped, sixty persons had been reported missing in the area. Many of those found on the Devil's Ranch were never identified.

Initial report of the Matamoros massacre (Source - Dayton Daily News c.1989)

According to Thomas Wedge, who gave seminars to law enforcement organizations on cult murders, the Matamoros killing followed abakua rites. Based on the mutilations and the tattoos on one of the suspects, indications were that at least the leader was an abakua follower.

Wedge wrote that members of the cult have distinctive tattoos that "resemble chalices emitting lightning bolts, arrows, the weeping face of Christ, likenesses of Saint Barbara or facial teardrops similar to those displayed by Hispanic gangs in the Southwest." Some tattoos denote the role the individual plays in the cult, while others denote sexual preference.

Wedge described where rites are conducted immediately before a drug deal, to make sure it's successful.

Detective Oscar Roque of Miami's Homicide Division considered the abakua cult "dangerous." He described that in Cuba, when "abakua had their annual retreat, (people were told) you should not leave your children out, because they would take them for sacrifices." This date was June 24, known as the feast day of St. John the Baptist, which coincides with the summer solstice. Miami police said they were aware of abakua followers who were tied to several grave robberies, for persons seeking skulls to be used in their rites.

A U.S. Officer who asked not to be identified said of the murders, "They were performed to compromise the gang members and bind them closer to him." Once they had killed, he held their lives "in his hands".

Sara Aldrete

Police searched Costanzo's home in Mexico City. Inside, they found a hidden torture chamber.

After the discovery on the ranch, Constanzo fled with his lover and Aldrete, leaving all his followers to face the authorities. Police searched for the group, suspecting they might have escaped to the United States. In the meantime, exhumations continued, and the body count mounted to 23.

Wanted posters and a reward were posted, but the weeks slipped by without either Constanzo or Aldrete being spotted.

The police asked an anthropologist who specialized in palo mayombe for help. He told them to televise the burning of the nganga and the shed where the ritual items and altars were.

Constanzo was living with Aldrete, Martin Quintana Rodriguez, his current lover and bodyguard, and two more followers in a luxury condo in Mexico. The supernatural taint lingered. Authorities burned the cult’s nganga—a sacred cauldron—and ritual shed on television, hoping to break its power. Costanzo became distraught when he saw the nganga and the shed go up in flames.

Costanzo dead with his most recent lover c/1987

On May 6, 1989, police officers were going door-to-door in an unrelated search for a missing child near where Constanzo and three of his followers, Aldrete, Quintana, and a cartel hitman named Alvaro "El Duby" De Leon, were hiding.

Constanzo panicked when he saw the police at the door and began shooting at them. Police fired back, and a gunfight broke out that lasted 45 minutes and involved 180 officers.

When police finally entered the apartment, they found Constanzo and his lover dead in a closet. Constanzo had ordered El Duby to shoot him and Martin Quintana.

Aldrete, de Leon, and Omar Francisco Orea Ochoa, who was Costanzo's other lover, were found unharmed and hiding in a bedroom.

Later, Aldrete told a press conference that Constanzo became desperate, urging El Duby to kill him and his lover. "He was shouting, ‘Do it! Do it! If you don’t, things will go badly for you in hell.’"

When police searched Aldrete's apartment in Matamoros, which she shared with her mother, they found a small room stocked with cult paraphernalia and an altar spattered with blood. By contrast, her apartment in Texas had no type of cult symbology in it.

Maria de Lourdes Guero Lopez, 29, and Maria del Rocio Cuevas Guerra, 43, who had been renting the apartment on behalf of Constanzo, were arrested soon after.

Sara Aldrete, Elio Hernandez, and his brother Serafin were sentenced to over 60 years each. Aldrete's behavior was so contradictory, police believed she displayed symptoms of multiple personality disorder.

Omar Orea, Constanzo’s "wife," was convicted of the murder of Ramon Esquivel, a transvestite in Mexico City. However, Orea died of AIDS before he could serve the 35 years he was sentenced to.

Eleven other cult members were charged with different crimes. Two remained at large.

Of the Mexican victims, only nine were identified, and police suspected others were never found.

None of them was prosecuted for Mark Kilroy's murder.

Sara Aldrete was released in 2002 after serving about 13 years of her 62-year sentence. She changed her name to Sara Maria Aldrete Davila to distance herself from her past. She is still subject to potential prosecution by American authorities for the murder of Mark Kilroy if she ever enters the United States, or if Mexico ever agrees to extradite her.

Other Known Victims

1988

May 28: Hector de la Fuente and Moises Castilo (both shot)
Unspecified date in July: Raul Paz Esquivel (tortured and dismembered)
Unspecified date in August: Unnamed victim (tortured and killed)
Unspecified date in November: Jorge Valente de Fierro Gomez (cult member; killed for using drugs)

1989

February 14: The following four were all tortured to death: Ezequiel Rodriguez Luna, Ruben Vela Garza, and Ernesto Rivas Diaz
February 23: Unnamed victim (attempted to kidnap, but was shot to death in a struggle)
February 25: Unnamed victim (cousin of one of the cult's members; tortured and killed; meant to make up for the botched killing of the February 23 victim)
March 13: Unnamed victim
March 14: Mark J. Kilroy, 21 (killed by a machete blow)
March 28: Gilberto Sosa

Shack at Hernandez ranch where evidence of human sacrifice and torture were found c.1989

Costanzo was dubbed "El Narcosatanico de Matamoros" (the Narcosatanist of Matamoros).

His shot-up body, marked with occult tattoos, was returned to Miami. He was autopsied a second time, and his body was riddled with 16 bullet holes.

Rumors were that his body was cremated. Another is that he was buried at Our Lady of Mercy, the only Catholic cemetery in Miami, in 1989. The location is secret, for fear that it would attract individuals seeking to become one of his followers even after death.

But the mystery continued since Adolfo Constanzo appeared not to be who he claimed to be. It seems that the Costanzo surname was not his. No one in the three neighborhoods where the family lived had heard of this surname. Coral Park Senior High School had no record of Adolfo Constanzo attending the school during the 1980s when he was of high school age and living in Miami.

His mother was identified by five different names in police records, but she was best known as Delia Aurora Gonzalez del Valle. The only marriage certificate for her was recorded in 1977 when she married Marcos A. Gonzalez.

Since 1974, she had been charged with assault and battery, writing bad checks, grand theft, and traffic violations. In 1989, she was wanted for violating probation after pleading guilty to stealing blinds and a refrigerator from a rented townhouse. She was also scheduled for trial in May 1989 for bouncing a check in 1984.

Costanzo's youngest brother, Fausto Rodriguez, born in 1968, pleaded guilty to a cocaine charge in 1988 after police found half a gram of the drug during a traffic stop.

After Adolfo left for Mexico, his family bounced from house to house. They lived at 4320 SW 14th St., Miami, in 1988, and briefly at 2524 SW 5th St. in 1989. This was a luxurious, split-level home with a pool. It's believed Adolfo was sending his family drug money to live on.

Neighbors on 14th Street complained that the family left behind 30 cats when they moved. Another neighbor said that for several weeks after the family left, people slipped into the house during the early morning hours. Evidence of santeria worship was found.

In 1983, Eduardo Cifuentes said six headless chickens and goats were left on the doorstep of his house after a feud with members of Constanzo's family. A year later, lawyer David Sostchin, who closed on the Constanzo home, said he saw a big black cauldron in a tiled garage worship room. It had bones in it.

Four American kidnapped by cartels in Matamoros c.2023

Postscript: Echoes in the Blood-Soaked Borderlands

More than three decades after the Devil’s Ranch horrors, Matamoros continues to claim fresh victims in its unrelenting cycle of violence. On March 3, 2023, four Americans were brazenly kidnapped in broad daylight. Authorities later recovered two of them dead and the other two alive, though one suffered serious wounds.

The official story claimed the group had been caught in the crossfire between rival cartel factions or mistaken for Haitian drug smugglers. The victims—Latavia Washington McGee and three companions—had told others they traveled from the Carolinas so one of them could receive a “tummy tuck” from a Matamoros doctor. They drove a white minivan across the border from South Carolina, and cartel gunmen immediately crashed the vehicle, opened fire, and hustled the Americans into a waiting pickup truck.

Eric Williams who survived Matamoros kidnapping inside a shack where cartel had take him c.2023

Mexican police launched a frantic search, but the captors moved their prisoners between several locations. Officers eventually found the group in a wooden shack east of Matamoros, along the road to Baghdad Beach. Two lay dead; all had endured torture. Authorities blamed the Scorpions, a ruthless splinter group of the Gulf Cartel (Cartel del Golfo – CDG), for the kidnapping and murders.

Later revelations in September 2023 shattered the innocent tourist narrative. Latavia Washington McGee had actually traveled to Matamoros with her three friends to establish a drug connection for her husband, Termario McGee. The “tummy tuck” story served as nothing more than a convenient cover. Termario sat in a South Carolina prison serving a 10-year sentence for drug trafficking. Latavia supposedly intended to smuggle narcotics back into the facility so he could continue dealing behind bars. The couple had dated for ten years and been married for three.

Despite the twists and lies surrounding this modern tragedy, Matamoros has long held a sinister reputation for bloodshed—especially where outsiders are concerned.

In June 1989, Martin Quintana's sister told police that Adolfo's first madrina was still at large, practicing her blood magic in Guadalajara. And from jail, before he died, Omar Orea said, "I don't think that the religion will end with us, because it has a lot of people in it. They have found a temple in Monterrey that isn't even related to us. It will continue."

Even today, as of 2026, Matamoros remains one of the most dangerous cities on earth—a place where cartel violence and old shadows seem to feed one another. The Devil’s Ranch and the narco-satanic rites of El Padrino stand as a grim warning: some borders separate not just nations, but the living from forces that hunger for blood and souls.

The ghosts of that Devil’s Ranch still haunt the border, reminding the world that in Matamoros, the line between cartel savagery and ancient darkness has never been clear—and the blood never truly dries.