Sage Stallone's Death , Cause Revealed

According to TMZ, Sylvester Stallone's first son who was found dead in his home on Friday July 13th died of natural causes - a heart attack. TMZ obtained the L.A Coroner's report. Toxicology test came back "negative except for a sub-therapeutic level of hydrocodone," - though the drug played no role in his death.

Sage was 36.