The coroner's report is in for Sage Stallone, the son of Sylvester Stallone, 66, who died in July at the age of 36, and it appears that the son of the screen giant died of coronary artery disease by natural causes.

A toxicology report came back "negative except for a sub-therapeutic level of hydrocodone," said Coroner Chief Craig Harvey, according to the Los Angeles Times. The traces of the drug reportedly played no role in Stallone's death.

After news of his son's death, Sly Stallone skipped several promotional events for his new film, The Expendables 2, which also stars Arnold Schwarzenegger, Jason Statham, Jet Li, Dolph Lundgren, Chuck Norris, Jean-Claude Van Damme, Bruce Willis and Liam Hemsworth.

Sage Stallone appeared in Rocky V in 1990 as his father's son, Rocky Balboa Jr. He also played opposite his dad in 1996's Daylight.

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