23. War Machine
When you change your name to War Machine, the warning signs are surely there that you’ve got a little bit of a problem. Former UFC and Bellator veteran Jonathan Paul Koppenhaver was convicted in 2017 on 29 felony counts during the assault of his then-girlfriend Christy Mack.
War Machine almost killed the porn actress during a brutal attack which culminated with Mack suffering 18 broken bones, a fractured rib, a ruptured liver and a broken nose. He also tried to rape her during the savage onslaught. The former fighter is now serving life in prison with the possibility of parole after 36 years.