Stephen Sentyz, 42, was last seen going north along Route 252 near the Springton Lake Reservoir, authorities said. Police searched the area near the reservoir on Wednesday, July 10.
Sentyz was wearing a blue t-shirt, shorts, and black/white sneakers, according to investigators. He has a shaved head and a beard.
Anyone who saw him on Monday or has seen him since is being asked to call Aston Township Police Department at 610-497-2633 or submit a tip through Crimewatch.
Click here to follow Daily Voice Bristol and receive free news updates.