The San Ysidro McDonald's massacre was an act of mass murder which occurred at a McDonald's restaurant in the San Ysidro neighborhood of San Diego, California, on July 18, 1984. The perpetrator, 41-year-old James Huberty, fatally shot 21 people and wounded 19 others before being killed by a police sniper approximately 77 minutes after he had first opened fire.At the time, the massacre was the deadliest mass shooting by a lone gunman in U.S. history, being surpassed seven years later by the Luby's shooting.