You must be referring to the NYC cop who is a member of the NYC motorcycle gang that beat the driver of an SUV this past week. According to NBC News he is a member of the the gang that stopped the car, trashed it, and severely beat the driver. Apparently he was at the scene of the attack, but as best I remember the news article he may or may not have taken part in the actual beating.
Whether or not he participated in beating the driver and/or terrorizing the victim's entire family, he was at the scene and should not only be fired he should be charged with a felony along with every other member of that gang.
The reports I’ve seen indicate that there were as many as FIVE police in the gang, with one being the guy pounding in the window with his helmet.
Perhaps you and I will live long enough to actually know the truth.