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.