As seen online, from 1998:
““Terry had been troubled by numerous medical problems in recent years,” her mother said. “She had beaten the odds and had made a full recovery from a successful liver transplant operation last November”
— from Terry McQueen; Daughter of Actor Owned Production Company - Los Angeles Times as of 24 June 2026
Terry McQueen had HH, hereditary hemochromatosis, also known as genetic haemochromatosis.