Kabary Salem, was a former professional Boxer who is famous for fighting Joe Calzaghe

Joe Calzaghe

Joseph William Calzaghe, CBE, MBE is a Welsh former professional boxer. He is the former WBO, WBA, WBC, IBF, The Ring & British super middleweight champion and The Ring light heavyweight champion....

 for the WBO super middleweight title in October 2004 and managed to knock Calzaghe down in the 4th round, however he lost the contest on points. He also fought Lucian Bute

Lucian Bute

Lucian Bute is a Romanian-Canadian professional boxer, currently based in Montreal, Canada. Bute is the current IBF Super Middleweight champion...

 and lost the fight by TKO
in the 8th round, Kabary announced his retirement after the fight.
Kabary is regarded as one of the dirtiest fighters of all time, having used constantly headbutts, which, in one occasion, has caused the death of his opponent Randie Carver

Randie Carver

Randie Carver was an American Super middleweight boxer from Kansas City, Missouri.-Amateur career:Carver had an outstanding amateur career, winning the 1993 National Golden Gloves Light middleweight championship....

 in 1999.
He expressed no regrets for that accident and he has keep fighting with dirty tactics and headbutts constantly, in one occasion, against German boxer Mario Veit

Mario Veit

Mario Veit is a German boxer who is one of only two boxers to have beaten Juergen Braehmer....

, he broke the nose of the referee with an accidental head-butt.