Sage Stallone may already be buried in the ground but his cause of death remains a mystery, according to his official death certificate filed in L.A.

 Sage Stallone Official Cause Of Death Mystery

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Sage’s death certificate lists his death as C.O.D. which in coroner speak means “deferred.”

Reportedly the coroner is waiting for results of various drug tests before confirming exactly what killed the 36-year-old son of Rocky actor, Sylvester Stallone.

Another note on the report says that Sage’s body was found on July 13 — but it does not specify a definitive date of death.

It’s believed by many involved with the case that Sage may have been dead for several days before he was discovered.