Prosecutors have just revealed more stunning allegations against Terry Kennedy ... saying they believe the skateboarding star became enraged for "no apparent reason" before committing murder.
The DuPage County State's Attorney's Office made the announcement in a statement to TMZ Sports on Monday ... shedding more light on the alleged incident that resulted in the death of 23-year-old Josiah Kassahun.
Prosecutors say that on July 27, at around 11:05 a.m., Kennedy, his ex-girlfriend, and Kassahun checked out of a Comfort Suites Motel in Oakbrook Terrace, Ill. and began walking toward Kennedy's ex's car.
But, while on the walk, officials say Kennedy got upset for "no apparent reason."
Prosecutors say Kassahun tried to calm the 36-year-old skateboarding star down ... but that's when Kennedy allegedly punched the man in the face, causing him to fall to the ground and strike his head on the pavement.
Officials say Kennedy then kicked Kassahun in the torso ... before leaving the area in his ex's car.