In 2012, local DJ Ervin Holton is shot dead on his friend’s porch. With no witnesses, police turn to the security cameras opposite – did they catch the killer?

When student Julissa Brisman is found shot and bound in a hotel room in Boston, police use cameras to find her killer and are shocked by what they uncover.

In 2012, young entrepreneur Terry Porter is found dead by his neighbour. There is no forensic evidence or witnesses, but surveillance footage may have the answer.

When Louise Dickey is discovered brutally murdered in a bath of her own blood, police are stumped. But, nearby surveillance cameras may lead to the shocking truth.

The Lady Vanishes. When 69-year-old Ina Clare Richardson is found brutally murdered in a park, police turn to security cameras to piece together the puzzle of her death.

When Carl Starke is shot dead close to his home in Florida, police turn to CCTV to help hunt his killer, resulting in a huge manhunt and shocking on-camera interview.

After Christopher Duncan disappears after leaving his apartment in Texas, police make a grim discovery. Surveillance footage points to a dangerous killer.

In 2009, 27-year-old Jessika Kalaher is found strangled in her car in Texas. With her wallet and car keys missing, detectives turn to security cameras for clues.

In 2016, car salesman Hufracio Arteaga is found stabbed to death in his Michigan City office. Will surveillance cameras from a nearby building reveal the killer?

The murders of Tom and Jill Estes. When their bodies were found behind a dumpster in Missouri, police were baffled - until a receipt leads to CCTV of a blood-stained suspect.

In 2015, care worker Torrance Cheeves is found stabbed to death in his Texas home. With no suspects and a trail of puzzling evidence, will CCTV offer clues?

When the body of Celina Petersen is found dumped in an alley in Seattle, surveillance footage from across the neighbourhood reveals the shocking truth.

Andrew Nesbitt is found dead on his 46th birthday in his Wisconsin apartment after a night out. Officers turn to CCTV in local bars, cabs, and street corners.

When 12-year-old Alajawan Brown is shot dead outside a shop in Washington, near to an earlier shooting, police refer to CCTV to see if the two are connected.

When 37-year-old Natasha Cournoyer goes missing, her family and friends are desperate for answers. Police use surveillance video to track her final steps.

On Valentine's night, James Enright is stabbed to death near a station in Burnaby, Canada. Through CCTV, police discover it was caught on a phone camera.