The cause was an apparent heart attack, the company said.
He died in 1968 of an apparent heart attack at age 55.
Her death was first reported in the American press as being an apparent heart attack.
He died of an apparent heart attack in 1962 at age 62.
He died from an apparent heart attack in 1980 at 50 years of age.
He died on 31 March 2011 of an apparent heart attack.
John's father, Jack, died of an apparent heart attack a year earlier.
He died of an apparent heart attack on November 20, 2004.
He died on August 20, 1991 of an apparent heart attack.
The cause of death was later identified as an apparent heart attack.
