The married couple who were murdered in front of their daughters while hiking at Devil’s Den State Park in Arkansas died as “heroes protecting their little girls,” according to the victims’ devastated family, as a massive manhunt for the killer continues.

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.

A professional fugitive recovery agent says investigators are likely using surveillance footage, cell phone records, and forensic evidence to track down the suspect