JOIN USSylvester Stallone's 36-year-old son Sage, who is also an actor, was found dead at his home in Hollywood, media reports said.
Sage Moonblood Stallone, who appeared in the 1990s as Rocky Balboa Jr, the son of his Hollywood A-lister father's title character, had been in "good spirits" of late, his lawyer said, calling his death a "tragedy yesterday."
Sylvester Stallone, who is currently promoting his latest movie "Expendables 2," was a "wreck," celebrity news website TMZ reported, adding that he was found at his apartment by either a maid or his girlfriend.
Paramedics were called but he was pronounced dead at the scene, TMZ added.
"I have just gotten a report that he was found dead at his home," Sage Stallone's attorney George Braunstein told the New York Post.
"He was in good spirits, and working on all kinds of projects," he added. "He was planning on getting married. I am just devastated. He was an extremely wonderful, loving guy. This is a tragedy."
"It's just a tragic, tragic loss for this wonderful, loving person," he added to television station NBC4.
A spokesman for the Los Angeles County Coroner's office, reported to be handling the case, told AFP: "We are in the initial stages of our investigation" but gave no further details.
A spokesman for the LA Police Department (LAPD) said he could not confirm the death, adding: "There's a death investigation, they're waiting for the coroner to identify the body."