Still (2015)

Tom Carver is a man stumbling blindly towards a crossroad in his life, thrown out of focus by the death of his teenage son a year earlier. He becomes involved in a feud with a teenage gang after a seemingly harmless collision with a young kid. As the feud becomes more horrifying, Carver's world starts to unravel forcing him to make decisions that will change his life forever.

Unfortunately the movie Still is not yet available on HBO Max.