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Later life
Hickey worked on his art and exhibitions throughout his later life. In 1973 Hickey was diagnosed with Parkinson's disease. The Royal Institute of Architects of Ireland made him an honorary member in 1989. In 1986 Hickey also became head of painting in National College of Art and Design fine art faculty until 1990. In 1990 his oil works, ‘Virginia Creeper’ and ‘Garden Wall: Morning Wicklow Hillside’ were exhibited. His work in the 1990s included the two etchings, ‘Still Life with Pears and Apples’ (1992) and ‘The Fourth Tree (1993).’ The Royal Institute of the Architects of Ireland held a retrospective exhibition of his work in 1994 which was followed by a show held in the Graphic Studio Gallery in 1995 of Hickeys etchings. Hickey had completed twenty seven pieces over the two and a half years prior.

There was a television documentary on RTE on 28 November 1996 called ‘Patrick Hickey Artist’ in tribute to Hickey. Due to deteriorating health he had to retire from teaching in the 1990s. In May of 1997 he held his last exhibition at the Taylor Galleries in Kildare street in Dublin. Due to his lack of energy and slowing strength because of his Parkinson's disease he wanted to make this last exhibition his best. This exhibition consisted of seventeen oil paintings, all of them landscapes or still lifes. The works included ‘Huguenot Cemetery’ and ‘Cat with Aubergines.’ In 1997 Hickey moved from Mulgrave Terrace in Dun Laoghaire to nearby Clearwater Cove. The house in Mulgrave Terrace sold for two million euros. He gave the new owners of the house a painting of Japanese cherry trees.

Death
Hickey died from Parkinson's disease on the 16 October in 1998. He was 71 years old. He died in his home at Clearwater Cove, Monkstown with his wife Elizabeth (‘Bizzie’) Hickey, (nee Hallinan) present. Hickey was cremated in Glasnevin Crematorium. In 2000 the Graphic studio gallery held an exhibition of Hickey's work and a posthumous exhibition of his work was held in 2007 by the Dalkey Arts Centre.