Sage Moonblood Stallone, son of famous actor Sylvester Stallone, was discovered dead Friday in his San Fernando Valley home, according to law-enforcement officials. He was 36.

Many of the details of Sage Stallone's death are uncertain, but sources told TMZ that he died because of an overdose of pills. It has not yet been determined whether the overdose was accidental or the result of suicide.

Sylvester Stallone's publicist, Michelle Bega, said in a statement: Sylvester Stallone is devastated and grief-stricken over the sudden loss of his son Sage Stallone. His compassion and thoughts are with Sage's mother, Sasha. Sage was a very talented and wonderful young man. His loss will be felt forever.

Although he didn't have the same kind of film career as his father, Sage Stallone famously appeared in Rocky V as Rocky Balboa's son, Rocky Jr.. He acted with his father a second time in the movie Daylight. He also dabbled in directing and producing movies, according to IMDB.

Sylvester Stallone is reportedly a wreck, TMZ said.

Twitter has exploded with the news of Stallone's loss, with Sylvester Stallone's being one of the trends.

RichardRoeper tweeted: Sad news about Sly Stallone's son Sage dying, reportedly of an overdose. Played Rocky's son in Rocky V.

IAM_MALI posted: Too many good people get depressed & caught up on drugs Sad! Rest in Peace Sage Stallone! This industry can really stress u out if U let it!

Sage Stallone was found by his housekeeper in his home, George Braunstein, his lawyer, told Fox40.

We don't have any of the details, Braunstein said, according to the Los Angeles Times. He wasn't depressed. He was thinking about getting married. He just had his whole life ahead of him.