Gerry Anderson's son, Jamie Anderson, said he was "very sad" to announce the death of his father.
He confirmed he died peacefully in his sleep at midday today, after suffering mixed dementia in recent years.
A donation page dedicated to his memory and support of the Alzheimer's Society has been set up.
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Monica O'Connor and at least two other people were killed in the incident, and a British man remains missing.
Lively downpours across the south, Wales and Northern Ireland today - slow moving and intense with hail and thunder.
"The council's inspector judged there was an imminent health risk and an immediate voluntary closure of the takeaway was agreed."