Looking back at the case of Lithuanian murderer Vitas Plytnykas, who killed a fellow worker in Scotland, leaving her severed head to be found on a beach.

Looking back at the case of the murderer Graham Fisher, who stabbed and then ate two of his young victims in the summer of 1998.

A profile of the serial killer John Cooper, who murdered four hikers and terrorised camp sites for decades, raping and robbing campers.

A secret love triangle led to Jack Campbell murdering his love rival in a siege which shook Orkney Island.

The case of the killer Malcolm Green, who murdered women and dumped their dead bodies in bags.

Michael Ross was just 15-years-old when he shot Shamsuddin Mahmood in the face and fled, but police caught up with him a decade later.