Famed skateboarder Terry Kennedy will likely be facing homicide charges now -- the man he allegedly attacked in an Illinois motel has died ... TMZ Sports has learned.
The Cook County Medical Examiner's Office tells us 23-year-old Josiah Kassahun passed away Saturday. TMZ Sports broke the story ... Kennedy was arrested last week after cops say he attacked Josiah in an Oakbrook Terrace motel, leaving him with a fractured skull and a concussion.
Those injuries have proven fatal, and while Kennedy had initially been booked for the assault ... prosecutors will now have to consider adding a manslaughter or murder charge. We've reached out to the DuPage State's Attorney's Office for clarification.
As we first reported, Kennedy was also booked last week for repeatedly threatening to murder the cops who tracked him down and arrested him for the alleged attack on Josiah.
A police spokesperson says Kennedy told cops, "I will kill one of you police. We kill police where I'm from."
It's still unclear what prompted the alleged motel attack, but based on social media postings ... it appears Kassahun and Kennedy were friends at one time.
Kennedy -- a big-name skater who's ridden with Rob Dyrdek and appeared in several skating video games -- is still behind bars. The 36-year-old's bail had been set at $100,000 during a hearing last week.
It will likely be jacked up much higher, now that Josiah has died as a result of the attack.
Kennedy was already facing multiple charges ... including aggravated battery in a public place and threatening a public official.