Isaiah Tilghman, 33, has been on the run since escaping the Blair County Prison back on Dec. 3.
(The video above is from a previous report)
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Marshals say Tilghman used a rope and the ventilation shaft to flee the facility.
On Friday, the U.S. Marshals announced the discovery of the F-150 pickup truck in the 2600 block of S. Front Street in South Philadelphia.
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Tilghman remains at large. He was incarcerated for drug offenses and parole violations.
Anyone with information on Tilghman can call the U.S. Marshals Philadelphia Tipline at 1-866-865-TIPS(8477).