【衰仔失乐园】BTK---Dennis Lynn Rader---Span of killings:1974-1991---Number of victims:10;【衰仔失乐园】The Backpacker Killer---Ivan Milat---Span of killings:1989-1994---Number of victims:7;【衰仔失乐园】Johann Unterweger---Span of killings:1976-1992---Number of victims:10-11