Updated at 7:09 p.m.
The Baltimore-Washington Parkway is open again after an accident closed the northbound lanes between Route 450 and Route 202.
Delays remain, backing up into the District.
The crash that caused the road closure involved a pedestrian, who was transported to a hospital. Though the Metropolitan Police Department had tweeted that the pedestrian was killed, U.S. Park Police Sgt. Lelani Woods said the victim had sustained life-threatening injuries but was alive.