Police searching for the killer of a beloved grandfather find the murderer close to home wielding a shocking weapon.

When a beloved elderly woman is viciously murdered, detectives discover a chilling connection to another unsolved murder; the trail points to someone from her past and investigators race to hunt the killer down before they can strike again.

When an athletic and popular college student is violently murdered in her apartment, police track down several surprising suspects, including one with a disturbing obsession, before crucial evidence unmasks a dangerous predator no one saw coming.

A wealthy trader and father of four is gunned-down at home while his family is tied up in a closet; police dig into affairs, mob links and a missing co-worker, until a new lead and a taped phone call reveal a plot decades later.

When a devoted mother vanishes from home, a series of grisly roadside discoveries take police on a hunt for a killer; detectives follow a path of greed and desperation until a shocking twist leads to a culprit with a bizarre motive.

When an outgoing college student is gunned down, police investigate disapproving roommates, a psychic and an infamous serial killer; decades-old evidence reveals a killer that original detectives had previously overlooked.