The L.A. Times reports Hager apparently died in his sleep, was in poor health and had been depressed since the death of his identical twin brother in May 2008.
http://www.latimes.com/news/obituaries/la-me-passings10-2009jan10,0,7716145.story
http://www.latimes.com/news/obituaries/la-me-passings10-2009jan10,0,7716145.story