Sylvester Stallone's son Sage died from natural causes due to a heart condition, the Los Angeles County Coroner has ruled. Sage Stallone was found dead at his Hollywood home by an employee and a relative on 13 July. Bottles of prescription pills were found but it was not clear if they were connected with his death. Officials said on Thursday that the 36-year-old died due to a condition that causes blockage of the arteries. Toxicology results showed Stallone had a only a small amount of the sedative hydrocodone in his body. No other drugs were detected and the death has been classified a natural death. The actor and film director's sudden death stunned his family and friends. Sylvester Stallone's publicist described him as "devastated and grief-stricken" and the actor skipped several promotional events for his film The Expendables 2. Sage Moonblood Stallone was the oldest of Sylvester Stallone's children and co-starred with his father in two films, Rocky V and Daylight. He also became involved in movie-making, directing a 2006 short, Vic, that was screened at the Palm Springs Film Festival. In 1996 the young Stallone co-founded Grindhouse Releasing, a company dedicated to preserving and promoting the B-movies and exploitation films of the 1970s and '80s. Sylvester Stallone's spokeswoman said the actor had no comment about the coroner's findings.