On October 12, 1962, Mingus punched Jimmy Knepper in the mouth while the two men were working together at Mingus's apartment on a score for his upcoming concert at The Town Hall in New York, and Knepper refused to take on more work. Mingus's blow broke off a crowned tooth and its underlying stub. According to Knepper, this ruined his embouchure and resulted in the permanent loss of the top octave of his range on the trombone – a significant handicap for any professional trombonist.
This attack temporarily ended their working relationship, and Knepper was unable to perform at the concert. Charged with assault, Mingus appeared in court in January 1963 and was given a suspended sentence. Knepper did again work with Mingus in 1977 and played extensively with the Mingus Dynasty, formed after Mingus's death in 1979.
How dare you. And Mingus would not approve.
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Mingus was a famous jazz musician