EntertainmentEntertainment NewsReport: John Mahoney’s Cause of Death RevealedCopyFacebookXTruthGettrLinkedInTelegramEmailSaveJohn Mahoney. Joey Foley/Getty ImagesBy Jack Phillips2/7/2018Updated: 2/7/2018PrintThe cause of death of “Frasier” actor John Mahoney was revealed in a new report on Wednesday, Feb. 7, TMZ reported.Mahoney passed away Sunday in hospice care, according to his publicist.