Police called to a street in Landover, 10 miles from Washington DC, found the body of Tyson Barnette, 26. They are working to identify possible suspects and a motive for the killing.
US Postal Service spokesman Frank Schissler said it was rare for a postman to be killed while delivering mail. A postman was killed north of Houston, Texas, in May and in 2010 a delivery worker was shot dead in Miami, Florida.
The postal service is offering a 100,000-dollar (£61,700) reward for information leading to an arrest over the shooting.
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