Team spokesman Patrick Smyth said that although the team was aware of his arrest, Alexander's release was a football decision to clear a roster spot for cornerback Chevis Jackson.
Aurora police were called to an apartment Monday morning and were told by a woman who said she was Alexander's girlfriend that he had assaulted her Sunday night. The 23-year-old Alexander was arrested for investigation of misdemeanor assault and battery. He was taken into custody shortly before noon and was released after posting $2,000 bail. A court date was set for Tuesday.
Alexander's arrest was the third for a Broncos player this season. Linebacker D.J. Williams was stripped of his captaincy after his October arrest on suspicion of drunken driving and rookie cornerback Perrish Cox faces a sexual assault case following his arrest earlier this month.
Alexander signed with the Broncos in April as an undrafted free agent out of Clemson. He was promoted to the active roster on Oct. 16 after spending the first five weeks on Denver's practice squad. He finished with one tackle on defense and three special teams stops.