This video is amost 10 years old but it's new to us. This could be dirtier than Tyson biting Holyfield's ear. James "The Harlem Hammer" Butler lost by unanimous decision to Richard "The Alien" Grant in a 2001 fight. Butler had his gloves removed after the fight and approached Grant to supposedly offer some congratulatory love. The Alien got a little more than he expected.
Grant was knocked out and received a broken jaw. Unfortunately for Butler, the police decided to listen to the announcer. They arrested and charged him with aggravated assault. He eventually moved up to murder. In 2006, he pleaded guilty to voluntary manslaughter and arson in the death of Sam Kellerman, the brother of boxing analyst Max Kellerman. He was sentenced to 30 years in prison. Did we mention that the boxing match was a charity event for 9/11 victims? Stay classy, Hammer.