Nikolai Dzhumagaliev “Metal Fang”
Dzhumagaliev wore a vicious set of metal teeth.
He was caught in 1981 and accused of killing seven prostitutes, although it is believed that he may have killed as many as one hundred.
He was a cannibal, and sometimes served his victims to unwitting friends.
Eventually he was found not guilty by reason of insanity, and spent some thirty years in mental facilities before being released.