A Los Angeles man who allegedly beat a homeless man with a rock at Griffith Park, leaving him in a coma, has pleaded not guilty to attempted murder.
Prosecutors say 54-year-old Tyrone Isumu of Encino entered the plea Wednesday and could face a life sentence if convicted.
He remains jailed.
Police Detective Gina Franco says Isumu and the 39-year-old victim met at a liquor store on Monday and went to some brush off a Griffith Park trail to take drugs, where they got into an argument.
Authorities say Isumu beat the man with a rock and a steel trash bin, causing serious injuries to his face and body. Prosecutors say the man has paralysis and is comatose.
However, Franco says he's expected to recover. His name hasn't been released.
This story has been updated.