On September 30, 1990, four days after his 22nd birthday, Moroso was killed in an automobile crash on North Carolina Highway 150 near Mooresville, North Carolina only hours after finishing 21st in the Holly Farms 400 at North Wilkesboro Speedway. Traveling at an estimated , Moroso lost control of his vehicle in a curve with a posted speed limit, skidding over 200 feet before being struck in the driver's side door by an oncoming car in the opposite lane. The resulting collision killed both Moroso and Tammy Williams, a 27 year old nursing assistant, wife and mother who was driving in the opposite lane. The passenger in Moroso's vehicle, girlfriend Debbie Bryant, as well as a passenger in Williams' vehicle both survived with injuries.