Arkansas state police are investigating a double homicide in Devil’s Den State Park and looking for the suspect who is still at large. A 43-year-old man and a 41-year-old woman were found dead on a walking trail about 2:40 p.m. on July 26, state police said. The case is being investigated as a pair of suspected homicides.

The manhunt for a suspect has entered its third day after a couple was killed while hiking at Devil's Den State Park in Arkansas. Chris Swecker, former FBI assistant director, tells "Elizabeth Vargas" the remote nature of the crime's location makes it "perfect for predators" to commit such awful offenses.