That Time Sergey “Krusher” Kovalev Murdered A Man In The Ring.

In his 2011 fight against Roman Simakov, Kovalev knocked down his opponent in the sixth round and the fight was stopped one round later and Kovalev was awarded a TKO victory. Simakov was taken to the hospital, where he lapsed into a coma and died three days later. Watch the full fight here.