A couple, just engaged, is found brutally murdered in a car. To investigators it looks like an execution. No leads until a surveillance camera 90 miles away gives the investigation its first break - a killer bent on revenge. It's a race against time.

A teenage girl disappears from a Kansas Mall. The only clue for detectives - the haunting final images of her on surveillance video. Somewhere in these frames hides the answer - and a killer...

Missey Smith, Kelsey's mother talks about the Act that was signed into law in 2009. Now, when someone goes missing or their life is in danger, cell phone companies must release information to law enforcement.

Two murders, one witness: Police investigate the strange disappearance of a reporter and exposed to an addictive world of gaming. Across the state a mom vanishes after a party. Detectives have no leads until cameras begin to spill their secrets.

Pensacola news reporter Sean Dugas was an extremely popular and well known guy. When he suddenly went missing, along with the entire contents of his home, police were stumped.

A collection of guns and equipment found in a dumpster 90 miles away seems completely unrelated until surveillance footage helps police piece together the story of a killer. Time is against the police as they track down Christopher Dorner.

A husband and respected businessman vanishes after a meeting. Meanwhile, a young mother doesn't come back from her job search. Cops can only rely on one witness-one that never lies-surveillance cameras.

In Pensacola Florida, two loving parents are brutally gunned down in their own home. The cop's only witness...one that never lies: surveillance cameras. It's what they must rely on, to catch the killers and bring them to justice.

After Skylar Neese disappeared, security camera footage showed police her two best friends were hiding something...but everyone wasn't prepared for the horrific truth - that it was in fact her two best friends that murdered Skylar, in cold blood.

Every parent's worst nightmare comes true when a schoolgirl disappears without a trace. But a few seconds of surveillance footage leads cops to the most shocking discovery imaginable.

Doug Coker vanishes after a business meeting. The perpetrator Pamela Moss's innocent half sister becomes unwittingly involved in the case. It's later discovered Pamela was previously convicted of murder under a different name.

In July 2009 a loving family is ripped apart when Byrd and Melanie Billings, parents to nine adopted kids, are brutally gunned down in their own home in Pensacola, Florida. Is it a robbery gone bad, or a gang hit?

Nursing student Michelle Le vanishes without a trace. Police discover footage that shows Le’s car driving around the parking lot where she disappears, but who is the driver?

Follow the victim, see what happened. All-new episodes of 'See No Evil,' Tuesdays at 10/9c. Only on Investigation Discovery!

Follow the victim, see what happened. All-new series 'See No Evil,' premieres Tuesday, February 17 at 10/9c. Only on Investigation Discovery!