After Cristina goes missing, detectives look for CCTV that may reveal her movements; when her cell pings at a location in Arkansas, detectives gather surveillance from the area in the hopes it will hold answers to Cristina's disappearance...

In Kinston, North Carolina, a woman finds Jack Davis in his home with a catastrophic head wound. Surveillance footage from Jack's house and a nearby neighbour's leads detectives on the hunt for his violent attackers...

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...

In a home in downtown Baltimore, a man finds 24-year-old father and youth worker Dion Smith executed with a shotgun. The other residents are cagey, but a suspicious visitor is singled out thanks to telling CCTV outside the victim's door...

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.

In Cleveland, Texas, a man guns down Conbino Crasto during a gas station robbery; surveillance video sends police on a hunt for three masked suspects.

Detectives look for surveillance footage when a woman is discovered in a bath of her own blood.

When Laura Pietscher, a 28-year-old resident of Sebring, Florida, turns up dead in a dumpster 90 miles away in Tampa, detectives turn to CCTV footage to trace her fatal journey and identify her murderer.

When 30-year-old, mother-of-two, Mandi Gordon disappears, investigators turn to CCTV for clues to help them find her; they uncover a complex web of lies and a betrayal that lead to a botched cover-up, and a grisly discovery on a remote ranch in Texas.

When a man disappears in Hagerstown, Maryland, the only clue to his whereabouts is the white BMW he abandons at an apartment complex. Investigators turn to CCTV footage to piece together his final movements and unravel a deadly plot.

In Fernandina Beach, Fla., cosmetologist Joleen Cummings goes missing after an appointment, her last at Tangles Salon; CCTV footage shows her car in an isolated parking lot in the middle of the night; a closer look reveals an unlikely suspect.