Roger “Black Mamba” Mayweather, the uncle of Floyd Mayweather Jr., has died at 58 after years of deteriorating health. Mayweather turned pro in 1981. He went 59–13 with 35 knockouts during his 18-year boxing career and faced legendary opponents like Julio Cesar Chavez, Pernell Whitaker, and Ray "Boom Boom" Mancini. Mayweather held the WBA and lineal super-featherweight titles from 1983–84 and the WBC light welterweight title from 1987–89. After Roger Mayweather's final bout in 1999, he resumed his work as Floyd Mayweather Jr.'s trainer, becoming a key member of his team.