21+ Fatalities on Mount Diablo State Park from 2000 to 2018 (State Parks Records & Newspaper)
- November 14, 2011 - Loretta Hale, (Motorist), Solo Vehicle Collision, South Gate Road
- November 1, 2018, Patrice Courtier (Cyclist), climbing the "Wall" Upper Summit Parking Lot
- February 9, 2019, Chris De Bar (Pilot), Plane crashed near the Summit
- June 25, 2020 - Steve Sumner (Cyclist), climbing "Wall" Upper Summit Parking Lot
- July 5, 2020 - Julie Watson (Motorist), Solo Vehicle Collison, Summit Road
- Apparently, when Park Visitors are injured on Mount Diablo they are transported to local hospitals, and their deaths are often reported as NOT occurring on Mount Diablo.