Sage Stallone, the son of actor Sylvester Stallone, died of a heart attack and a toxicology report showed no signs of excessive drug use, the Los Angeles coroner's office has said.

Stallone, who died at age 36 on 13 July, suffered from coronary heart disease caused by atherosclerosis, which brought on the heart attack, Fred Corral of the coroner's investigative division said.

"There were no signs of an overdose. It was just a natural death," Corral said.

Stallone had a small amount of the sedative hydrocodone in his body, Corral said, but it was an acceptable level and one that could be found from taking over-the-counter pain medication. No other drugs surfaced in the toxicology report.

Sage Stallone's body was found in his Hollywood Hills home after family and friends became concerned when they hadn't heard from him for a day. A housekeeper went to check, found his body and called police, according to his lawyer, George Braunstein.

At the time police said there was no sign of foul play but speculation surfaced of a possible drug overdose.

Sage Stallone was the younger of two sons from the Rocky and "Rambo" actor's first marriage to Sasha Czack, whom he divorced in 1985.

Sage had appeared in a number of films, most notably with his father in 1990's Rocky V playing the title character's son, Rocky Balboa Jr, and in the 1996 disaster movie Daylight in which Sylvester Stallone starred as a hero leading an escape from a New York tunnel collapse. Sage played a prison inmate.

Sylvester Stallone, 66, has not been seen much in public since his son's death, even as his new movie, The Expendables 2, opened in theatres. On Thursday his spokeswoman said the actor had no comment.

Sylvester Stallone gave a recent interview to the ABC News show Good Morning America in which he said: "Time hopefully will heal and you try to get through it, but it's just something ... it's a reality of life."

source: guardian.co.uk