Nightmare Next Door

Police hope surveillance videos can help unravel a mysterious death.

A killer's inner demons give them up to authorities in Pennsylvania.

A 25-year-old cold case involving a murdered woman is solved in Tulsa.

A shocking discovery proves murder in the case of a Portland, Maine, woman.

A speck of blood makes a big splash in the case of a Florida murder.

A resident of Goshen, NH, reveals a grudge during a murder investigation.

A photo reveals the killer of a woman and her daughter in Massachusetts.

Detectives lean on new tech to find the killer of a young Illinois woman.

An accomplice's confession cracks the six-year-old case of an Ohio murder.

An unlikely witness helps Washington police nab a schoolgirl stalker.

A jilted lover is left to solve a cold case involving murder and arson.