Murder charges have been filed against the 18-year-old autistic son of a Kent State University professor who was beaten in her home and later died.

According to court records, a grand jury indicted Sky Walker on Friday on two counts of murder and one count of assault on a law enforcement officer.

Walker's mother, Gertrude "Trudy" Steuernagel, died Feb. 6, a week after she was severely injured in the beating. Friends have said she was devoted to caring for her son.

Court records show prosecutors are waiting for results of an evaluation to determine whether Walker is competent to stand trial.

Walker has been held at the Portage County Jail in lieu of a $2 million bond since the Jan. 29 attack.