Contrary to speculation, Drowning Pool singer Dave Williams died from natural causes, according to a coroner's toxicology report.

It was concluded last Friday that the 30-year-old singer died from cardiomyopathy, a disease of the heart muscle, the report said. Williams' condition, concentric left ventricular hypertrophy, prevents blood flow from the left ventricle to the right. Williams was never diagnosed with the disease, the cause of which is unknown.

The report also states nasal swabs showed no traces of cocaine and the drug was not found in his system.

The Dallas-based Drowning Pool were on tour with Ozzfest when Williams' body was discovered on their tour bus in Manassas, Virginia, on August 14 (see [article id="1457054"]"Drowning Pool's Williams Remembered As One Of Rock's Nicest"[/article]).

A public funeral was held August 18 in Plano, Texas, and plans for a DVD chronicling Williams' life is in the works (see [article id="1457096"]"Drowning Pool Fans Asked To Contribute To Memorial DVD"[/article]).