Peter Yarrow, the singer-songwriter, activist and founding member of the folk trio Peter, Paul and Mary, has died at 86 after battling bladder cancer.

Peter Yarrow, the singer, songwriter, and political activist who made up one third of the folk group Peter, Paul and Mary, has died at 86.

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