Porter is still charged with disorderly conduct and public drunkenness from the incident that resulted in his arrest. Charges of aggravated assault involving a police officer, simple assault against a bouncer and resisting arrest were dropped by the Allegheny County District Attorney office.
"Today our office was able to view surveillance video showing multiple angles of the events that led to the arrest of Steelers coach Joey Porter," the district attorney's office said in a statement. "Following that review it is the position of the office that the only charges supported by the video are summary disorderly conduct and summary public drunkenness.
"Our office will proceed on those charges and barring any additional evidence that is brought forward, we will withdraw the other charges at the appropriate time."
Pittsburgh police didn't immediately comment on the district attorney's decision.
Porter, a former Pittsburgh standout player, was placed on leave by the Steelers earlier this week.