John Entwistle, the 57-year-old bass player for the rock band the Who, died from a heart attack caused by cocaine use, the Clark County, Nev., coroner said Thursday.
Coroner Ron Flud ruled the death accidental and said it was not an overdose.
"The heart attack we believe was brought on by the significant amount of cocaine" that was in Entwistle's system at the time of death, he said.
The exact amount of the drug remains unknown.
Entwistle's body was found in his bed at the Hard Rock Hotel in Las Vegas on June 27, one day before the band was scheduled to kick off a three-month nationwide tour at the hotel's concert hall.
Entwistle was one of the band's founders. Another original member, drummer Keith Moon, died in 1978 of a drug overdose at the age of 32. Authorities said he took too many pills prescribed to control his alcoholism.
Entwistle's death was caused when cocaine caused the contraction of coronary arteries already damaged by heart disease, Flud said.
The queen gets Beatlemania
Queen Elizabeth II made two stops in Liverpool, England, on Thursday devoted to the Beatles, opening a new $48-million passenger terminal at John Lennon Airport and attending an exhibit of paintings by Paul McCartney.
At the airport, the queen met with Yoko Ono, the widow of the murdered Beatle, and viewed a life-size bronze statue of Lennon, complete with his trademark round spectacles and swept-back hair.
The queen left the airport for a meeting with McCartney at Liverpool's Walker Art Gallery.
The 60-year-old former Beatle showed the monarch a display of 70 of his largely abstract paintings and sculptures, saying afterward, "I think she liked them. She said they were very colorful, and I took that as a great compliment."
Winfrey, Grammer, Imus honored
Oprah Winfrey, Don Imus, Frasier star Kelsey Grammer and CBS News chief Washington correspondent Bob Schieffer are among this year's inductees into the Broadcasting & Cable Hall of Fame.
They'll be honored at a black-tie gala set for Nov. 11 at the Marriott Marquis in New York.
The hall was established in 1991 to recognize excellence in television, cable and radio.