The Steelers later announced they had waived Kelly.
Per official court documents (h/t Pro Football Talk's Michael David Smith), he was charged with two counts of making terroristic threats and one count of resisting arrest.
Liz Kilmer of WPXI reported that Kelly refused to leave a bar and was involved in a "struggle" with police.
Citing court documents, Kilmer said police were called to Mario's South Side Saloon after Kelly threatened an employee who skipped a song he requested to be played. After officers arrived, he told one of them, "I promise to God I'll [expletive] you up boy."
Per KDKA's Chris Hoffman, one of the officers punched him multiple times in the face to "gain control" of the situation. Kelly received treatment at a local hospital before being taken to Allegheny County Jail.
The 23-year-old began 2019 playing in the Alliance of American Football with the San Diego Fleet. After the league ceased operations in April, he signed with the Steelers and has appeared in all 14 games this season.