Mason Allen Schaeffer, of Brooklyn Park, was in the southbound lane of Ritchie Highway at 6th Avenue when he was struck by a pickup truck around 9:20 p.m., county police said.
The Chevrolet pickup fled the scene and Schaeffer was rushed to University of Maryland R Adams Cowley Shock Trauma Center in Baltimore with life threatening injuries.
The truck is believed to be beige or white color, cap with a ladder rack.
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