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.

Shocking cell phone footage turns a murder case on its head in New Mexico.

An unlikely clue is key to solving a young mother's murder in Arkansas.

Puzzling forensic evidence leads Ohio police to a familiar suspect.

Detectives must untangle a web of deceit and betrayal to solve a murder.

A tangled web of lies and deceit turns into a race to track down a killer.

A man is gunned down in broad daylight while walking down a street.

A Wisconsin town lives in fear after a local woman is brutally murdered.