He died on May 2, 1993 when the vehicle he was driving veered off a dirt road on his ranch near Tracy, California. The cause of death was a cervical spine fracture and partial dislocation caused by the blunt-force trauma of the crash. 
^ abcdEric Pace (May 4, 1993). "Julio Gallo, 83, Wine Industrialist, Dies". New York Times. Retrieved 2010-07-28. "In 1986, the Gallo winery sued Ernest and Julio Gallo's younger brother, Joseph, who had earlier managed vineyards for his brothers. The suit involved accusations of trademark infringement related to Joseph's opening of a cheese factory near his home in Livingston, Calif., using the family name."