The death, which is believed to have been a suicide, caused the closure of the El Cerrito del Norte station.
BART spokesman Jim Allison said at 8:15 a.m. that the station had been reopened and that service was getting back to normal.
There were still system-wide residual delays of five to 10 minutes, according to BART.
BART first reported the situation shortly before 5:30 a.m.
During the closure of the El Cerrito del Norte station, a limited bus bridge was set up to accommodate the affected passengers.