A Madison man is dead after being trapped underneath his car. Police say the 83-year-old victim was working on his vehicle Sunday night on Pine Street when the car started to roll down the driveway. Investigators believe the man was trying to stop the vehicle when he became trapped beneath one of the wheels. A neighbor said the victim had been having trouble with his car's parking brake. An initial investigation said the man had used a wood block to keep the car from rolling.