Born to Kill? Class of Evil

Peter Tobin hid the remains of a victim under the floorboards in a Glasgow church in 2006.

Altemio Sanchez, the apparently "perfect neighbor," pillar of the community and churchgoer, targeted Buffalo, New York during a campaign of rape and murder that spanned three decades, killing three women.

The case of couple Alton Coleman and Debra Brown, who terrorized America's Midwest in 1984, killing eight people.

Stephen Griffiths, who called himself the Crossbow Cannibal, murdered three people with each being horrifically dismembered and mutilated in his flat in Bradford, West Yorkshire.

The story of 14-year-old misfit Graham Young, committed to Broadmoor in 1962 after poisoning his stepmother and attempting to kill his father, sister and friend.

Joanna Dennehy lured her three victims to their deaths, and her spree ended with two knife attacks in broad daylight.