When police found 27-year-old Corey Lee Hughes dying on the floor, they turned to security video to find his attacker, then a neighbor's camera captured a suspicious SUV leaving the scene and investigators followed the clues to track down its driver.

Detectives turn to CCTV footage following the shooting of 65-year-old veteran and grandfather Billy Connole while he was taking a nighttime walk in Loveland, CO in 2015. The surveillance images reveal that the driver of an old pickup truck could hold the key to identifying the man's killer...