The diary of a teen girl that was found dead reveals a shocking assault.

A missing student's diaries lead to an alarming homicide investigation.

A diary helps detectives uncover what really happened to two teen brothers.

Police delve into the world of online deception and internet homicide.

A detective hopes interviews with a young boy will help him find a killer.

Evidence points to a string of serial killings in Pickering, Ontario.

Detective Postiglione spots a killer's window of opportunity.

An unlikely clue helps Detective Postiglione solve a double murder.

Detective Postiglione recalls a detail in the murder of a young mother.

A popular New Jersey teen is found murdered in her aunt's kitchen.

An aspiring musician is shot and killed in his neighbor's yard in Arkansas.

A transgender woman is found shot to death on the side of a Texas road.

Detectives investigate the death of a special needs teen in New York.

A Wisconsin woman dies by gunshot outside of her workplace.

An older man goes missing, and neighbors seem to be hiding information.

A security cam may be the only reliable witness to a scary public shooting.