Michael Douglas in Falling Down (1993)
William 'D-Fens' Foster: Foster completely lost his mind in the daily traffic jam. He was always a ticking time-bomb but was pushed over the edge when he was fired. He went to see his wife, disregarding the order of protection she had taken out to protect her and their daughter. In the course of his rampage he shocked some people and killed some people until he finally got killed by a good officer's bullet. Suggested by jonzcliff