Queens District Attorney Richard Brown announced on Thursday that he will not finish out his term.
Brown says he will resign effective June 1 due to ongoing health issues.
He announced in January that he would not be seeking another term in office, but had said at the time that he planned to finish out his term.
The 86-year-old has been battling Parkinson's disease for the past few years.
Gov. Mario Cuomo picked Brown from 14 candidates to replace retiring DA John Santucci in June 1991. He was elected to a full term that November. He won re-election six times.