On 14 March 1989, University of Texas at Austin student Mark Kilroy was kidnapped in Matamoros, Tamaulipas, Mexico, while vacationing during spring break. He was taken by his abductors to a ranch where he was tortured and sodomized for hours before being murdered in a human sacrifice ritual. Kilroy was killed with a machete blow and then had his brain removed and boiled in a pot. His killers then inserted a wire through his backbone, chopped off his legs, and buried him at the ranch along with 14 other people who had been killed there before him. Adolfo Constanzo, the leader of the cult, told his followers that human sacrifice granted them immunity from law enforcement for their drug smuggling operations. The killing drew worldwide media attention and initiated an international police manhunt because of the unusual circumstances of the crime.

After the bodies were discovered on 11 April 1989, Constanzo fled to Mexico City but was eventually tracked down. As the police surrounded his apartment complex, Constanzo died after ordering one of the cult members to kill him with a machine gun. Sara Aldrete, another high-ranking member of the cult, was arrested at the scene along with several others. In 1993, the cult members were found guilty of a number of charges, including capital murder and drug trafficking. Several of them, however, claimed they were not guilty of Kilroy's murder and told the press they were tortured to confess. Only two suspects remain at large.
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