After being rocked with news of the mother of three of his children passing, Floyd Mayweather is now forced to grieve the loss of his uncle and former trainer Roger Mayweather. The late Mayweather headed his nephew's training team and help mold the Michigander into one of the greatest boxers of all time. 

Roger Mayweather also had his share of in-ring success. He was a champion claiming the WBA and lineal super featherweight titles back in the '80s, in addition to the WBC light welterweight title. 

The cause of death has not yet been disclosed. Roger Mayweather was 58. 

Source: tmz.com