How Did Graham Clark Die?

Graham Ronald Clark was an English operatic tenor, known for roles such as David in Wagner's Die Meistersinger von Nürnberg, and especially the character roles Loge and Mime in Der Ring des Nibelungen. He was a principal with the English National Opera from 1978 to 1985, and performed at leading European and North American opera houses after he was recognised at the Bayreuth Festival in 1981, returning for 15 seasons. Clark appeared at the Metropolitan Opera in 112 performances over 15 seasons.