LOS ANGELES (CBSLA.com) — Sage Stallone, son of actor Sly Stallone, died of a heart attack, the LA County Coroner has confirmed.

The younger Stallone died at 36.

The coroner also reported no drugs were found in Stallone’s system.

Stallone’s body was found on July 13th.  At the time, officials theorized Stallone might have been dead several days. He was found by a housekeeper.

The coroner said Stallone had evidence of heart disease.

It is not known if Stallone was being treated for the illness.