Garrett Reid, a son of Philadelphia Eagles' head coach Andy Reid, died of an accidental heroin overdose on the campus of Lehigh University in August, officials announced Thursday.

Reid, 29, was found dead in a dorm room at Lehigh University during Eagles training camp on Aug. 5. He was helping the team as an assistant to the strength and conditioning coaches.

"The cause of death will be listed as acute opiate (heroin) toxicity and the manner of death is classified as accidental," said Zachary Lysek, Northampton County coroner.

While the cause and manner of Reid's death have been determined, District Attorney John Morganelli said his office's investigation is not over.

Evidence found in Reid's room at Lehigh included 64 needles, 47 syringes, 19 vials of an unknown liquid and drug paraphernalia, Morganelli said.

The investigation will now focus on trying to identify the people who provided Reid with the illegal drugs and drug paraphernalia either in Northampton County or in Philadelphia, said Morganelli, adding that Philadelphia District Attorney Seth Williams has offered his office's assistance.

"It's a process, but the people that are involved in this, in my office, police, are well trained," said Morganelli. "It's a process and we have a method or a system about how we go about tracking information down."

Investigators will also examine Reid's phone records.

"It's a meticulous process of working with the provider and also identifying individuals and numbers," said Morganelli. "Before we go to contact anybody, we like to find out if we can do a background on who they are."

Andy Reid and the Philadelphia Eagles have been very cooperative with the investigation, and some members of the organization may be interviewed again, Morganelli said said.

Garrett Reid was a recovering drug addict who had seemingly turned his life around. His father had indicated that his son may have had a relapse.