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Sage Stallone

Heart Attack -- Not Drugs

Cause of Death

8/30/2012 4:25 PM PDT BY TMZ STAFF
EXCLUSIVE

0830_sage_stallone_gettySylvester Stallone's son, Sage Stallone, died from a heart attack ... and no drugs were found in his system ... TMZ has learned.

The L.A. County Coroner has determined Sage died from natural causes.  As for why he had a heart attack, we're told there was evidence of heart disease. 

A source connected with the Coroner tells TMZ ... it was "unusual" for a person Sage's age -- 36 -- to have such advanced coronary problems, but that's what killed him.

Sage's body was found July 13, but he may have been dead days earlier.

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