July 18 marked 40 years since the mass shooting at a McDonald’s in San Ysidro. On July 18, 1984, a lone gunman walked into the McDonald’s on San Ysidro Boulevard and opened fire killing 21 people, and injuring 19 others. At the time it was the deadliest mass shooting in United States history. The ordeal lasted over 77 minutes before the gunman was fatally shot by a police sniper. To honor the victims, a ceremony was held at the Southwestern College Higher Education Center, which now sits on the former McDonald’s property. MORE: https://www.cbs8.com/article/news/local/ceremony-honors-victims-in-1984-mcdonalds-massacre/509-8c27e3df-a44b-4368-b5d2-b10007959639