An initial autopsy on Sage's body has been completed and was inconclusive.

Was there white powder found in the bedroom of Sage Stallone when authorities searched the house where he was found dead?

TMZ reports "authorities found baggies of white powder in the room where Sage Stallone died," and cites law enforcement sources who confirm detectives found "several little baggies in the bedroom."

TMZ adds that the mysterious white powder is being tested and suggests it could be cocaine or crushed Vicodin and also adds that there are "no obvious signs of white powder on Sage's body when he was found."

An initial autopsy on Sage's body has been completed and reports indicate the test proved inconclusive and the cause of death is not expected to be known until toxicology tests are completed.

A spokesman for the Los Angeles County Coroner revealed it can take six weeks for toxicology tests to be completed.

Meanwhile...Sage's father Sylvester Stallone has hired a private investigator to find out how his son died.

The 66-year-old actor, his brother Frank and an official from the Los Angeles County Coroner's Office met with P.I. Scott Ross - who was the lead investigator in the Michael Jackson molestation case and the Chris Brown/Rihanna battery case - at the star's home yesterday (July 17), where they discussed Sage's death and the status of the investigation.

According to gossip website TMZ.com, Sylvester wants Ross to figure out what happened to Sage, and even though there is no evidence of foul play, he is not ruling that out.

He also wants to know about Sage's final weeks, whether he was using drugs or consuming alcohol, and if there was anything troubling his son.

Sage, 36, was found dead at his home in Studio City on Friday July 13, 2012.

(Image: FameFlynet)