Visit https://www.markkilroyfoundation.org If you would like to donate to the Mark Kilroy Foundation.

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.

MENTIONED IN THIS EPISODE:

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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)

Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

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.

MENTIONED IN THIS EPISODE:

Preorder our collaboration with Hunt-A-Killer THE SALEM SLICER! We are SO excited for you to help us crack the case!

Want a signed copy of THE BUTCHER LEGACY?Click here to order from Premiere Collectibles!

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)

Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

Today we are revisiting episode 27 with an incredible tale of survival!

Mary Vincent survived something so horrifying that most of us couldn't even conjure it up in our nightmares. Her attacker, Lawrence Singleton, could have never imagined that Mary would walk away from where he left her to die in a canyon as a symbol of strength and resilience in the face of insurmountable odds. This is a story of survival, but also one of a justice system that is in desperate need of fixing.

RESOURCES

https://www.latimes.com/archives/la-xpm-1988-08-01-vw-4970-story.html

https://morbidology.com/left-for-dead-mary-vincent/
https://www.seattlepi.com/news/article/A-victim-a-survivor-an-artist-1106335.php

https://www.sfgate.com/news/article/Lawrence-Singleton-despised-rapist-dies-He-2886703.php

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)

Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.