Marvyn Iheanacho had only been out of prison for six months before he killed a five year old child, and the incident raised many questions as to how the child ended up in his care.

The case of Leroy Campbell, who was released from jail and two weeks later raped and murdered a nurse.

Police arrive at a murder scene where the killer is standing in front of them. His name is Peter Bryan, a paranoid schizophrenic who has killed before.

Convicted killer Ian Birley was out of prison on probation for 18 months before he killed again. His second murder has all the hallmarks of his original killing.

The crimes of one of Britain's most notorious female serial killers, Joanna Dennehy.

The remains of a young woman's body are found in the back of a blazing car. The suspected killers are two men who were both convicted murderers out of prison on parole.

Theodore Johnson evades murder charges twice, only to be set free to kill for a third time. Tragically, all his victims are the people closest to him.