sentences:  They remained married until Dahl's death at Oxford’s John Radcliffe Hospital in 1990.In 1991, Dahl posthumously published "Memories with Food at Gipsy House", a collection of anecdotes and recipes that she had written with her late husband.On 14 September 2009 the first blue plaque in Roald Dahl's honour was unveiled at a sweet shop in Llandaff.