LOS ANGELES (AP) — The 36-year-old son of Sylvester Stallone was found dead in his Los Angeles home Friday, leaving the actor grief-stricken as authorities investigated the cause, a publicist and authorities said.

Sage Stallone was found unresponsive by an employee and a relative. There were no signs of foul play or trauma, and no suicide note was found, Assistant Chief Coroner Ed Winter said.

"Sylvester Stallone is devastated and grief-stricken over the sudden loss of his son," publicist Michelle Bega said in a statement. "His compassion and thoughts are with Sage's mother, Sasha."