PITTSBURGH — A fired city police sergeant awaiting trial on charges that he wrongly beat a drunken fan at a high school football championship game last year used more force than necessary 56 times, county prosecutors said Monday.

Stephen Matakovich, 47, used more than the minimum force necessary — “forcible handcuffing” — every time he filed reports claiming people resisted his efforts to arrest or control them since 2011, Allegheny County prosecutors wrote in court papers. The instances of excessive force included 17 times in which he injured people by striking them in the head or face, they wrote.

The motion also details a December 2014 encounter in which Matakovich allegedly beat up a security guard who was trying to break up a fight, then wrongly charged that man with aggravated assault, prosecutors said.

Matakovich was fired and faces a state court trial next month in the Nov. 28 beating and arrest of Gabriel Despres, 20, at Heinz Field. Matakovich also faces federal charges that he violated Despres’ civil rights and then filed a false police report to obstruct the FBI investigation into the arrest.

Matakovich has testified that Despres — then 19 — adopted an “aggressive posture” and appeared ready to attack when Matakovich tried to get Despres to leave the stadium.

Surveillance video from the stadium shows Despres with his hands at his sides and not advancing when the officer suddenly pushes him down and then strikes him in the face.

The Steelers, sent the video to police Chief Cameron McLay. Use of force expert David Wright “has testified that the force applied by (Matakovich) was excessive, and the defensive reactions of Despres were not assaultive, but instead used for ‘self-preservation,”’ the motion said.