Update: according to the Washington Post:
The shooting occurred about 7:20 p.m. in the Cheverly-Landover area of the county, said Officer Harry Bond, a police spokesman. Apparently the man was delivering mail on or near Reed Street when the shooting occurred. It was well after sunset when the shooting occurred. Residents of the area said mail is not usually delivered there so late.
“It was mighty late,” the neighbor said.
It was thought that the carrier’s unfamiliarity with the route might have been linked to the lateness of his deliveries.
CHEVERLY, Md. – Prince George’s County Police are investigating a fatal shooting of a Postal Worker.
It happened Saturday evening on the 1600 block of Reed Street in Cheverly.
According to police, officers who responded found the Postal Worker shot.
He was pronounced dead on the scene.
The Washington Post has more details here.