PITTSBURGH — A jury acquitted a white former police officer Friday in the fatal shooting of an unarmed black teenager as he was fleeing a high-stakes traffic stop outside Pittsburgh, a confrontation that was captured on video and led to weeks of unrest.

Former East Pittsburgh Police Officer Michael Rosfeld was charged with homicide for shooting Antwon Rose II in the back last June. Rose was riding in an unlicensed taxi that had been involved in a drive-by shooting when Rosfeld pulled the car over and shot the 17-year-old in the back, arm and side of the face as he ran away.

The panel of seven men and five women — including three black jurors — saw video of the fatal confrontation, which showed Rose falling to the ground after being hit. The acquittal came after fewer than four hours of deliberations on the fourth day of the trial.

Rose’s family remained stoic as the verdict was read, with his mother telling his sister not to cry. Rosfeld’s wife began sobbing, and she and Rosfeld were hustled out of the courtroom by deputies.

There were tears and gasps in an overflow courtroom, and several people broke out in song: “Antwon Rose was a freedom fighter, and he taught us how to fight.”

Outside, dozens of protesters chanted: “Say his name: Antwon Rose the Second.”

The Rose family’s attorney, S. Lee Merritt, had urged a murder conviction, saying before closing arguments that it’s “pretty obvious” Rose was not a threat to Rosfeld.

Defense lawyer Patrick Thomassey told reporters after the verdict that Rosfeld is “a good man, he is.” He said he hoped the city remained calm, and “everybody takes a deep breath and gets on with their lives.”

Rose’s death — one of many high-profile killings of black men and teens by white police officers in recent years — spurred angry protests in the Pittsburgh area last year, including a late-night march that shut down a major highway.

On Friday, Assistant District Attorney Jonathan Fodi declared in his closing argument that Rosfeld had acted as “judge, jury and executioner.”