The Who's John Entwistle had cocaine in his system at the time of his June 27 death in Las Vegas, which has been ruled an accident by the Clark County (Nev.) Coroner's Office, Billboard.com has learne

The Who's John Entwistle had cocaine in his system at the time of his June 27 death in Las Vegas, which has been ruled an accident by the Clark County (Nev.) Coroner's Office, Billboard.com has learned. The consumption of cocaine exacerbated a pre-existing condition known as ischemic heart disease, which restricts the flow of blood. Death occurred due to "lethal drug effect in setting of significant natural disease," according to the coroner.

Entwistle, 57, was taking medication for a heart condition and died in his hotel room just hours before the Who was to kick off its North American summer tour. As previously reported, the first two shows were postponed but the trek continued on with replacement bassist Pino Palladino. The Who plays Mansfield, Mass., tomorrow (July 26).

A band spokesperson could not be reached for comment at deadline.