Ann Arbor police are looking for a man who punched out a stained glass window and assaulted a fraternity member who confronted him about it early Sunday at Chi Psi Fraternity on South State Street, police said.

Fraternity members heard commotion on the first floor and discovered the window was broken at 1:30 a.m., police spokeswoman Lt. Renee Bush said.

Frat members saw a man with a bloodied right hand and confronted him about the damage, Bush said. That's when the man punched a member, knocking him to the ground, police said.

According to police, the victim had a bump on his head. The man who broke the window left the area, police said. Damage was estimated at $300, Bush said.

The suspect was described as 6 feet, 2 inches tall, 185 pounds, with short brown hair, police said. No further description of him was available.

Anyone with information can call the police department's tip line at (734) 794-6939.