Episode 788: The Matamoros Devil Murders (Part 2)
- May 25, 2026
- 54:26
- Full Episode
In March 1989, twenty-one-year-old University of Texas student Mark Kilroy and some friends traveled south of the border to Matamoros, Mexico to celebrate the end of spring break, along with thousands of other American students that year. After drinking all night at a bar on the night of March 10, Kilroy got separated from his friends when they decided to call it a night a little after 2:00 am. No one would see Mark Kilroy alive again.
As one of several towns bordering the United States, Matamoros was popular with American tourists; however, by the late 1980s, it was beginning to develop a reputation for drug-related crime. In fact, Mark Kilroy was just one of sixty people who went missing in Matamoros in just the first three months of 1989 alone. When Kilroy’s friends reported him missing to the Brownsville, Texas police a massive search began, with investigators fearing Mark might have been kidnapped by one of the local gangs. It turned out, the truth was far worse than anyone had feared.
Visit https://www.markkilroyfoundation.org If you would like to donate to the Mark Kilroy Foundation
MENTIONED IN THIS EPISODE:
Buy Tickets to MORBID LIVE at Radio City Music Hall on June 27th!
Preorder YOUR copy of THE BUTCHER LEGACY
References
Associated Press. 1989. "Leader in cult slayings ordered own death, two companions say." New York Times, May 8: 14.
Assocoated Press. 1989. "Hypnosis tried in hunt for student." Fot Worth Star-Telegram, March 17: 24.
Bragg, Roy. 1989. "Cult 'godfather' ordered killing." Houston Chronicle, April 13: 1.
—. 1989. "Fateful party is re-enacted." Houston Chronicle, March 25: 1.
Cartwright, Gary. 1989. "The Work of the Devil." Tecas Monthly, June 1.
Douglas, Jack, and Major Garrett. 1989. "13th victim pulled from killing field." Houston Post, April 14: 1.
Garcia, Guy. 1989. "The Believers: Cult Murders in Mexico." Rolling Stone, June 29.
Humes, Edward. 1991. Buried Secrets: A True Story of Serial Murder, Black Magic, and Drug-Running on the U.S. Border. New York, NY: Dutton.
Kreps, Mary Ann. 1989. "Machete blow reportedly killed Kilroy instantly." Houston Chronicle, April 12: 1.
Mishra, Upendra Nath. 1989. "Police search properties owned by alleged cult leader." United Press International, April 20.
Perez-Trevino, Emma. 2009. "Remebering Mark J. Kilroy." Brownsville Herald, March 8: 1.
Sanders, Kathy. 1989. "Rumors of Satanists kidnapping children have parents terrified." Fort Worth Star-Telegram, April 15: 1.
Schutze, Jim. 2023. Cauldron of Blood: The Matamoros Cult Killings. New York, NY: Open Road Media.
United Press International. 1989. "Parents of missing student seek help from state." United Press International, March 29.
Warren, Susan. 1989. "Kilroys say drug users 'to blame' for son's killing." Houston Chronicle, April 13: 1.
Cowritten by Alaina Urquhart, Ash Kelley & Dave White (Since 10/2022) Produced & Edited by Mikie Sirois (Since 2023) Research by Dave White (Since 10/2022), Alaina Urquhart & Ash Kelley Listener Correspondence & Collaboration by Debra Lally Listener Tale Video Edited by Aidan McElman (Since 6/2025) Listener Tale Theme Music licensed from https://www.purple-planet.com Main Theme: Matti Paalanen — Trick or Treat — Provided by Jamendo Ad Music: Title: Artist: BlueJay Studio — Spooky Waltz — Provided by Jamendo
Brief Summary
Mark Kilroy's murder by a cult in Mexico reveals shocking brutality and the dark influence of Adolfo Constanzo.
Key points
- The Grumbling Stomach. A humorous exchange about their lunch choices and stomach noises.
- The Gruesome Case of Mark Kilroy. A warning about the upcoming dark story of Mark Kilroy's disappearance.
- Constanzo's Dark Demands. Saraphene reveals the chilling instructions given by Constanzo regarding sacrifices.
- Mark's Kidnapping. The moment Mark Kilroy is kidnapped after being separated from his friends.
- The Confession. Saraphene recounts the details of the cult's activities during a chilling confession.
- A Human Slaughterhouse. Detectives describe the scene at the ranch as a human slaughterhouse, shocking even seasoned officers.
Episode highlights
- The Grumbling StomachA humorous exchange about their lunch choices and stomach noises.“Did you just hear my stomach grumble?”0:17May 25, 2026
- The Gruesome Case of Mark KilroyA warning about the upcoming dark story of Mark Kilroy's disappearance.“This is a very gruesome case.”8:34May 25, 2026
- Constanzo's Dark DemandsSaraphene reveals the chilling instructions given by Constanzo regarding sacrifices.“Adulo told us we had to go get a white male, a young white male, like a spring breaker.”14:55May 25, 2026
- Mark's KidnappingThe moment Mark Kilroy is kidnapped after being separated from his friends.“They jumped him. They tied a blindfold around his eyes.”15:36May 25, 2026
- The ConfessionSaraphene recounts the details of the cult's activities during a chilling confession.“You won't be able to keep us here. You'll see.”19:57May 25, 2026
- A Human SlaughterhouseDetectives describe the scene at the ranch as a human slaughterhouse, shocking even seasoned officers.“That is the scariest thing I've ever heard.”22:01May 25, 2026
- Adulo Constanzo's BackgroundExploring the early life of Adulo Constanzo, who would become a notorious figure.“He had a divine gift.”27:50May 25, 2026
- The Mysterious VanishingTwo women mysteriously vanished after joining Adalfo Constanzo's group, raising unsettling questions.“Isn't it weird how people just mysteriously vanish when they know him?”35:40May 25, 2026






