(Cover) - EN Showbiz - Sylvester Stallone's son Sage died of a heart attack, it has been confirmed.

Sage, 36, was found dead at his Los Angeles home on July 13.

TMZ reports that the Los Angeles County Coroner's office has determined that the young man suffered from chronic coronary ailments. No drugs were found in Sage's system and his demise can be attributed solely to heart disease.

Sage was laid to rest at the St. Martin of Tours Catholic Church in Los Angeles last month.

Sylvester has spoken previously about his grief over the loss of his son.

"It's tough. It's very, very tough but if you have good friends and family support [you can get through it]," he told TV show Good Morning America.

"It's a horrible situation but time hopefully will heal. It's a reality of life.

"It's important to get back and try to start reliving your life or you can go into a spiral." (C) Cover Media