Police in Sparks, Nevada, identified a couple found dead Wednesday as two paranormal investigators from the Travel Channel series Ghost Adventures. Mark Constantino and his wife Debra were holed up in their daughter's apartment where Mark threatened to kill her. After gunshots were heard inside, SWAT broke in and found both dead. The incident began at 6:30 a.m. when a woman came home and found a male roommate dead and then reported her other roommate, Debra, was missing. Police believe the two incidents are connected. The Constantinos have a long history of domestic abuse.