WBC/WBA welterweight and junior middleweight champion Floyd Mayweather Jr. was talking to a friend on a webcam when the friend murdered his girlfriend and turned the gun on himself, according to reports.

TMZ reports that rapper Earl Hayes killed his girlfriend Stephanie Moseley, a professional dancer who had appeared in the Twilight films, and then committed suicide.

According to TMZ’s sources, Hayes had called Mayweather “in a rage” — using the popular video phone call service FaceTime — and accused Moseley of cheating on him.

Hayes then killed both Moseley and himself, with Mayweather still on the other end of the phone.

Mayweather “acknowledges he was a witness and heard everything”, TMZ said.

Hayes was once signed to Mayweather’s record label.