War Machine
Notorious MMAscumbag Jon ‘War machine’ Koppenhaver was once a healthy young UFC prospect with a bright future ahead of him. Unfortunately for The Ultimate Fighter veteran, he stated to lose his sh*t around the 2010 mark.
Here was one of his first major cock ups:

War Machine would go on to serve multiple prison stints, and is currently locked up awaiting trial for his brutal beating of pornstar actress Christy Mack.