Police Details of DJ AM's Last Day Alive

As the pieces are still being put together to identify the cause of Adam "DJ AM" Goldstein's death, a police source tells PEOPLE that on Friday, Aug. 28, the day he was later discovered dead in his Manhattan apartment, the celebrity deejay had sent his last text message to two friends at 1 a.m.

The subject of his message was his scheduled Las Vegas gig that very Friday night at the Rain Nightclub in the Palms Hotel – but he never made it.

Sixteen hours after Goldstein texted, a friend called 911 because Goldstein had failed to answer his cell phone and, when it was time for him to leave for his flight, his two traveling companions could not reach him.

After the NYPD broke down the door to his SoHo apartment, says a police source, they found the lifeless Goldstein in bed, wearing sweatpants and a crack pipe nearby. They also discovered a half bag of crack cocaine, along with a crack pipe, and prescription drugs.

On Saturday, the New York City Medical Examiners office announced that after an initial autopsy proved "inconclusive," more tests, including a toxicology report that might require weeks, would be performed.

Goldstein, who often talked about his past struggles with drug abuse, claimed he was off drugs for 11½ years.

He also recently told the Associated Press while promoting his upcoming MTV reality show Gone Too Far, about getting users off drugs, that while filming the show he held a crack pipe for the first time in years – but that a guardian angel was looking after him.

"There's no better way to remember what it was like when I was at my bottom than to see someone at their bottom," he told AP.