Washington, July 18 (ANI): Sylvester Stallone has hired a private investigator to find out how his son died.

The 'Rocky' actor has met P.I. Scott Ross, who was the lead investigator in the Michael Jackson molestation case and the Chris Brown/Rihanna battery case at the his home on Tuesday, and discussed Sage's death.he duo also discussed the status of the investigation.

According to gossip website TMZ.com, the 66-year-old actor 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, Contactmusic reported.

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

An initial autopsy on Sage's body, which was completed on Sunday was proved inconclusive.

Moreover, the cause of death is not expected to be known for up to two months until the toxicology tests are completed. (ANI)