Law enforcement sources said Thursday it's unknown whether the pills played any role in Stallone's death but said the amount of pill bottles found at Stallone's Studio City home was enough to warrant investigation. Some of the containers were empty, the sources said. it's unclear to whom the pills were prescribed.
The Los Angeles Police Department is helping in the probe, but officials have said there is no evidence of foul play.
Sage Stallone's attorney said his death came as a total shock.
A housekeeper found the body of Sage Stallone, according to Braunstein.
Officials also probed prescription drugs in the death of Whitney Houston and Michael Jackson.