TCU quarterback Trevone Boykin was arrested and accused of assaulting a patrol officer following a fight at Pat O'Brien's in San Antonio early Thursday morning.
He was charged with public intoxication, resisting arrest and assaulting a public official, which a third-degree felony.
TCU suspended Boykin following the arrest in advance of the Alamo Bowl on Saturday.
Boykin posted an apology on his Twitter account Thursday night.
He tweeted: "Word can't describe how sorry I am. I truly let down my family, teammates and the TCU and Fort Worth communities who have supported me so much. I have no excuses for my very poor decision, and I'm embarrassed about it."
Boykin's suspension is a major challenge for the Horned Frogs to lose the senior starting quarterback days before No. 11 TCU plays No. 15 Oregon in the Alamo Bowl.
Boykin's tweeted continued: "My teammates are my brothers. There's nothing I wanted to do more than play one last game with my family seniors."
Separate NBC TV affiliates in Texas reported bar patrons recognized Boykin and began "trash talking."
Boykin reportedly took a swing but he missed his target and struck a bar employee. Police apparently tried to intervene when Boykin hit an officer. Multiple officers threatened to taser Boykin before he finally subsided, NBC San Antonio reported.
Boykin finished 10th in Heisman Trophy balloting. He had 3,574 yards passing and 31 touchdowns.
TCU also suspended junior wide receiver Preston Miller for the Alamo Bowl, but Miller's infraction was not announced.