Killers: Caught on Camera

A man and his accomplice go on a killing spree, leaving four dead. In the UK, a student is stabbed to death.

A man calls the police after an attack; phone data tracks the killer. A dog lover is found murdered at home.

A whirlwind romance ends with a woman dead under a blanket. In the UK, a man with stab wounds is discovered.

A mysterious meeting ends with a woman's body found on a country lane. A mother is dead after a house fire.

A man buying yogurt is linked to a missing woman. A student disappears after a cab ride home.

A dead woman in a car is linked to two brothers. Trash bags full of body parts are found in a shed.

In Florida, a 13-year-old girl is found with stab wounds. In Colorado, a woman goes missing after a night out.

A young woman is stalked, but her cry for help is ignored. An estranged husband threatens to kill his wife.

In Texas, a man "fails" to stop his wife's suicide. In Washington state, a man has a deadly plan.