Hagenkotter, 34, was an inmate at the Riverside Correctional Facility before he made his escape on November 30.
He was in custody for retail thefts.
Officials said Hagenkotter fled the facility while working a detail assignment in the orchard behind the Philadelphia Industrial Correctional Facility.
Authorities found Hagenkotter's body at approximately 2:30 p.m. Monday after responding to reports of a male who was discovered unresponsive in a warehouse on the 1100 block of East Venango Street.
First responders pronounced Hagenkotter dead at the scene.
According to the Philadelphia Department of Public Health, Hagenkotter died from a drug overdose and the manner of death has been ruled an accident.
Authorities say there was a broken air vent and a pushed-out fan in the warehouse, which may suggest a forced entry. Additionally, police say a ladder was found nearby.
Hagenkotter initially did not have any identification on him when his body was discovered. Authorities say they identified him through fingerprint analysis.