He is the first person in West Sussex to die after contracting the virus.
Dr Sara Lightowlers, Medical Director for Sussex Community NHS Foundation Trust, said: “Sadly, we can confirm that a man who was being cared for at The Kleinwort Centre, and had tested positive for COVID-19, has died.
“The patient, who died on 23 March 2020, was aged 82 and had underlying health conditions.
“His family has been informed and our thoughts and condolences are with them at this difficult and distressing time.”
He is third person in Sussex to die after testing positive for coronavirus. The other two deaths were at the District General Hospital in Eastbourne.