UPDATE: TMZ sucks per usual.
The former UCLA standout allegedly knocked the security guard out cold with one punch.
According to the police report, witnesses say … MJD’s buddy was told by security to stop touching a young female. The buddy allegedly “slapped” a security guard on his chest … and a melee ensued.One of the security guards reportedly put MJD’s friend in a headlock to stop the fight … and that’s when MJD stepped in and clocked the guard. After the incident, the security guard spoke with police — and cops noted that the guy’s jaw was “swollen a great deal and had a large lump on his jaw bone.”