Ortega/WireImage/Getty Images) Sylvester Stallone's 36-year-old son Sage was memorialized in a private ceremony Saturday at St...Sylvester Stallone and Sage's mother, Sasha Czack, led a small procession of mourners, according to The New York Daily News .
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Sylvester Stallone's son Sage (L) and brother, Frank Stallone
Sage Stallone 's cause of death is still a mystery ... this according to his official death certificate filed in L.A. The death certificate lists Sage's C.O.D. as "deferred" -- which means the coroner is waiting for the results of various tests,...