UPDATE 10:22 PM PT -- Law enforcement sources tell us ... Sage's death does NOT appear to be a suicide. We're told there was NO suicide note found at the scene.
Sources tell us officials DID find "numerous empty pill bottles" in the area where Sage's body was discovered. No word on what types of medication the pill bottles were for.
We're told an autopsy is scheduled for some time in the next 48 hours.
UPDATE 5:15 PM PT: Sylvester Stallone's rep, Michelle Bega, tells TMZ, "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."
6:04 PM PT: Now here's a crazy picture -- the L.A. County Coroner van, flanked by a celebrity tour filled with snap-happy tourists. Welcome to Hollywood, folks.
Sage Stallone -- Sylvester Stallone's son -- has died and sources tell us the cause was an overdose of pills.
The details surrounding the death are still unclear .. but we're told he was found in his L.A. home by either a maid or his girlfriend. Paramedics were called to the home and pronounced him dead at the scene.
Sources tell us authorities are trying to determine if the death was intentional or accidental.
We're told Sylvester is a "wreck."
Sage famously made his film debut alongside his father in the 1990 movie "Rocky 5" -- playing the role of Rocky's son Robert Balboa.
He went on to act and direct in several films ... including the 1996 film "Daylight."
Sage's mother is Sasha Czack
Update
Sage Stallone Dead for at Least Three Days
Sage Stallone was dead in his room for a minimum of 3-4 days and possibly as long as a week ... this according to law enforcement sources connected with the case.
Our sources tell TMZ ... Sage "lived like Howard Hughes" ... he often spent days in his room which was "littered with junk," including an enormous number of cigarette butts, beer and soda cans, and food.
We're told there were two drawers filled with various pill bottles, some of which were "huge."
Our sources say Sage was living like a hermit ... no one had spoken with him since a week ago Friday. Although the housekeeper had been there earlier this week, she had specific ongoing instructions never to enter Sage's room. In fact, we're told the housekeeper was told to never even knock at the door.
One law enforcement source called the room "disgusting," saying it reeked of various smells.
We're told Sage's mother called the housekeeper yesterday after being unable to reach him, asking her to stop by and check on him. That's when she discovered the body.
Law enforcement sources tell us it's pretty clear from the evidence they saw ... Sage's death was an accident.
tmz