Douglas, 42, was charged with second-degree strangulation and second-degree assault on his girlfriend, The Hartford Courant reported Tuesday.
He was released on $50,000 bail.
Security officers at the Hartford Marriott Downtown called police Sunday after the girlfriend asked a hotel clerk if the hotel had cameras on the premises, police Sgt. Glendaly Garcia said.
Both hotel staff and responding officers noticed red marks on her neck, Garcia said.
Officers located Douglas and arrested him.
Douglas played for the New York Jets, Philadelphia Eagles and Jacksonville Jaguars from 1995 to 2004. He was fired as an ESPN analyst in August.