7. Dennis Nilsen
Outfit: Metropolitan Police, London
Crime: Dennis Nilsen, Britain's answer to Jeffrey Dahmer, was a member of London's legendary Metropolitan Police force for a while before he quit and launched a second career as a full-time weird loner who liked to kill young gay men, sometimes consuming parts of their bodies. So at least the Met Police can say he wasn't on the force when he was doing his thing. Nilsen said he did what he did because he didn't like being alone. He killed at least 15 before he was arrested.
Some reports say Nilsen didn't feel so bad about the murders, but felt awkward about eating guys. Well, at least it was awkward for him.