08/29/2009 at 03:20 PM EDT
Although Adam "DJ AM" Goldstein's autopsy was completed Saturday afternoon, exactly how he died still remains a mystery.
"The cause of death was inconclusive because we need to do additional testing," New York City Medical Examiner spokesperson Ellen Borakove told PEOPLE on Saturday, a day after police discovered Goldstein
, 36, dead in his Manhattan apartment. "The testing would include toxicology and tissue testing. We don't expect any results for several weeks."
Borakove could not comment further on the case.
"It's under investigation and when the investigation is complete we will have a cause of death and a manner of death," she said, adding that the ME's office is investigating in conjunction with the New York City Police Department.
Police entered Goldstein's residence Friday afternoon after a 911 caller stated the celebrity DJ had not been seen in two days. A police source told PEOPLE prescription drugs and a crack pipe were also found in the apartment.
Although Goldstein had a history of drug abuse
, he recently said he had been clean for 11½ years and had been working with other addicts since six months into his sobriety. He recently wrapped the MTV reality show Gone Too Far
, on which he helped other addicts find a way to end their dependence.
He also narrowly escaped death last September with Blink-182's Travis Barker when their small plane crashed
, leaving Goldstein with serious burns.