DeMarco's daughter broke the news on social media.
DeMarco, or 'Dom' as he was called, immigrated to New York from Italy in 1959 and opened Di Fara on Avenue J in Midwood in 1965.
His pizza quickly built up a following, and over the decades, it was consistently ranked among the best slices in the city.
Di Fara's in Midwood was closed on Thursday.
There are also family-pwned shops in Williamsburg and Las Vegas.
His daughter's message did not reveal what DeMarco died from.
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