Federal Aviation Administration spokesman Ian Gregor initially said two people were aboard, but later clarified only one person was on the plane, a single-engine Cessna 152 that crashed on federally owned land at Military Ocean Terminal Concord.
Contra Costa County Fire Protection District Marshal Robert Marshall said federal firefighters at the military base called the county coroner's office about a fatality related to the crash. No other information about the victim was immediately available.
The FAA and National Transportation Safety Board will investigate the plane crash, Gregor said.
Stay with ABC7 News for more on this developing story.