Mary Travers, one of the three singers in the 60s folk trio, Peter, Paul and Mary, has died.

The band’s publicist says Travers died in a Connecticut hospital. She had battled leukemia for years.

Perhaps the band’s best known work, Puff the Magic Dragon. Although the band didn’t write the song, they made it popular in 1963 recording. Although the song was thought to suggest drug use, in particular, marijuana, all band members have constantly denied the allegations.