Sigrid Stevenson’s chilling murder on the stage of a locked campus theater still haunts a New Jersey college as new theories about her killer emerge.

London, 1888. The city is gripped by a string of murders, each more gruesome than the last. Experts delve into one of history’s most notorious mysteries.

Patrick Mullins’ unmanned boat is found miles from his home. When his body surfaces a week later, authorities are left with more questions than answers.

Given a furlough to go Christmas shopping in 1973, a convicted killer escapes. Police have come close to apprehending him but believe he’s still at large.

After checking in at a luxury hotel with no ID or credit card, a woman dies from a gunshot. Years later, her identity — and her death — remain a…