The singer-songwriter and social activist best known as one-third of the folk-music group Peter, Paul and Mary, has died at age 86.

Musician Peter Yarrow attends a book signing for his new book "It's Raining, It's Pouring" at McNally Jackson on August 1, 2012 in New York City. Brad Barket/Getty Images Yarrow, along with Paul ...

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 ...