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.

Peter Yarrow, one third of the chart-topping 1960s folk trio Peter, Paul and Mary and co-writer of 'Puff,the Magic Dragon' has died.

Peter Yarrow, the pioneering folk musician who found massive success as part of the musical trio Peter, Paul, and Mary, has died at the age of 86, according to the Associated Press. Yarrow was born in New York City in 1938,

Peter Yarrow, who has died aged 86, was the Peter in Peter, Paul and Mary, the American singing trio which took folk music into the commercial mainstream in the 1960s.

Peter, Paul and Mary performed the song at the 1963 civil rights March on Washington, cementing its place in the folk activist canon. Their version of the progressive protest song "If I Had a Hammer" -- written by Pete Seeger and Lee Hays -- earned the ...

Peter Yarrow, namesake folk singer of the legendary trio Peter, Paul and Mary, has died, according to multiple reports. He was 86.

Peter Yarrow, one of the principal singers of the seminal 1960s folk trio Peter, Paul and Mary, has died of bladder cancer, The New York Times reports. He was 86 years old. Yarrow was born in New York,

The trio he formed with Noel Paul Stookey and Mary Travers became a pop phenomenon, scoring hits like “If I Had a Hammer” and “Puff the Magic Dragon.”

of the 1960's era musical trio "Peter Paul and Mary," performs during a memorial tribute concert for folk icon and civil rights activist Pete Seeger in New York on July 20, 2014. (AP Photo/Kathy ...

of the 1960’s era musical trio “Peter Paul and Mary,” performs during a memorial tribute concert for folk icon and civil rights activist Pete Seeger in New York on July 20, 2014.

After a Peter, Paul and Mary concert in 1980 at the now-defunct Front Row Theater in Highland Heights, Chuck Fink waited patiently with fans for the folk group to sign

As much a story of Dylan as it is of the people who surround him, we’re introduced to the likes of Pete Seeger, Woody Guthrie and most notably, the Queen of Folk, Joan Baez. Monica Barbaro takes on the role of the incredible American singer-songwriter and activist opposite Chalamet,