Peter Yarrow, the singer-songwriter who was one-third of the folk trio Peter, Paul and Mary, has died at age 86, his representative confirmed to ABC News.

Folk singer Peter Yarrow — writer of the timeless classic "Puff the Magic Dragon" and one-third of the legendary 1960s trio Peter, Paul and Mary — died Tuesday, a family representative said. He was 86 and had been diagnosed with bladder cancer four years ago.

Peter, Paul and Mary quickly emerged as the winning 1960s iteration of a clean-cut, meticulously arranged supper-club and concert-hall approach to performing folk songs, passed down from 1950s groups like the Weavers and the Kingston Trio.