Matamoros, Mexico/Brownsville, Texas. In March 1989, 21-year-old Mark Kilroy had been talking about Spring Break with his friends since the start of the fall semester. A pre-med junior at University of Texas, Mark couldn't wait to travel to South Padre Island, Texas for some sunshine and fun. But the morning after partying in the border cities of Brownsville, Texas and Matamoros, Mexico, his friends realize Mark has vanished. Two months later, a trail of evidence lead investigators to a remote region of Mexico where Mark was one of a dozens victims of ritual satanic sacrifice and cannibalism.