Mike Gibbons was an American boxer who claimed the Middleweight Champion of the World status following what Polish American professional boxer's murder?
Mike Gibbons:  The brother of heavyweight Tommy Gibbons, Mike claimed Middleweight Champion of the World status in 1909 following Stanley Ketchel's murder. Stanley Ketchel: Stanisław Kiecal (September 14, 1886 – October 15, 1910), better known in the boxing world as Stanley Ketchel, was a Polish American professional boxer who became one of the greatest World Middleweight Champions in history.
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