Ex-Boxer Julius Francis Won't Be Arrested Over Street Knockout, Cops Say

Police say former heavyweight boxer Julius Francis -- who famously fought both Mike Tyson and Vitali Klitschko early in his boxing career -- will not be arrested over his one-punch, street knockout this past weekend.

Metropolitan Police said in a statement Wednesday they have concluded their investigation into Francis' punch -- which went down while he was working as a security guard in the U.K. on Saturday -- and will not arrest the 57-year-old over it all.

"Officers have spoken to all parties involved and have reviewed relevant CCTV," cops said. "No further action will be taken in relation to the incident involving the security guard and male customer."

Police initially began investigating Francis after he was seen on video throwing a right hook at a man's jaw after the guy had appeared to get into a confrontation with security guards at BOXPARK Wembley.

The man was reportedly causing a scene at the venue, and after he was booted by the guards, he became combative.

BOXPARK Wembley founder Roger Wade believed Francis did no wrong ... saying in a statement following the incident that the former fighter was simply defending himself -- and it seems cops agreed with him.

Francis fought professionally 48 times in his career in the 1990s and early 2000s, losing to both Tyson and Klitschko in their matches.