University of Texas police are asking for the public's help identifying someone they say punched another man after a September football game against the University of Southern California.

Police on Monday released video of who they think the attacker is. They described him as a 6-foot-tall, 185-pound man with brown eyes and blonde hair.

The video shows the man walking after the incident occurred on Sept. 15, UT police said. The department said it took a few months to finally obtain the video.

Video of the punch will not be released, police said. The man who was punched suffered a broken eye socket and had to have surgery, they said.

The incident happened around 11 p.m. on the south side of the stadium after the game was over, UT police detective Cory Morrison said. In the video, the attacker appears to be a UT fan and the victim is a former student of the university, Morrison said.

Police have spoken with the victim, but still do not know what caused the substantial punch, Morrison said.

"Typically the fans are usually happy with one another," he said.

Anyone with information about the incident can call UT police at 512-232-3573.

Do you recognize this man? He was seen on video punching another man on the south side of the Main Building (Tower) after the UT vs. USC football game on 9/15/18. W/M, 6 feet tall, 185 pounds, brown eyes & blond hair. If you can help, call Detective Morrison at 512-232-3573.pic.twitter.com/PZGNEwyh1c

— UT Austin Police (@UTAustinPolice)April 8, 2019