DETROIT (AP) — A Detroit police officer who was suspended after being accused of sitting in his patrol car during the fatal shooting of another officer has retired, his attorney said.

Sgt. Ronald Kidd, a former Marine, had post-traumatic stress disorder on the night of the shooting, Odey Meroueh said.

“Kidd was compelled to retire from the police department today,” Meroueh said Thursday.

Meanwhile, a funeral was planned Friday for Officer Rasheen McClain, who was killed on Nov. 20 while trying to capture a suspect in a home invasion. JuJuan Parks is charged with murder.

Police Chief James Craig said Kidd was in a patrol car a block away from the house when McClain and other officers asked for support. Kidd didn’t join them and was subsequently suspended.

“Our investigation into the sergeant’s actions is continuing,” Craig told The Detroit News “As to whether or not his inaction amounts to criminal misconduct will ultimately be the decision of the prosecutor when our investigation is finished.”

Meroueh said Kidd, an officer for 21 years, is not a coward.

“While Sgt. Kidd mourns for officer McClain, nothing he could have done on the night in question could have prevented the tragedy that occurred,” Meroueh said.