Neighbours of the couple called the police after they heard gun shots from the couple's LA home and heard Stephanie screaming. When police got there, they found the bodies of Stephanie and Earl. And there even reports that Floyd witnessed the murder via Facetime.
Sources connected with Hayes tell us ... around 2 years ago he separated from Stephanie because of what he says was her affair with Songz. They got back together but, as one friend put it, "He was crushed and never got over it." We're told he frequently brought up Songz.
Hayes accused Moseley of having multiple affairs with various other entertainers. She was a backup dancer who worked with numerous famous singers, including Chris Brown and Usher, but we're told Hayes never mentioned them as a source of conflict.
Hayes and Moseley married in 2008 and his friends say he loved her and tried rationalizing staying together.
"Floyd Mayweather was on FaceTime with one of his best friends when the guy pulled out a gun, shot his wife and then killed himself ... TMZ has learned.
Sources tell us ... rapper Earl Hayes called Floyd on FaceTime Monday morning in a rage, over claims his wife -- VH1 star Stephanie Moseley -- had been unfaithful.
According to our Floyd sources, Earl said he was going to kill his wife. The champ was pleading with him to get a grip ... to no avail. Floyd will not say how much he saw, but he acknowledges he was a witness and heard everything.
Floyd is in shock and is having extreme difficulty dealing with the fact that he witnessed a horrifying murder/suicide." TMZ reports