The musician was a member of the made-for-TV pop group The Monkees.
He starred in hits like I'm A Believer and Daydream Believer.
According to a message posted on the band's official Twitter feed, Tork had "passed peacefully."
Saturday Brunch
I Saw Mommy Kissing Santa Claus
The Jackson 5
I Saw Mommy Kissing Santa Claus
The Jackson 5
Peter Tork dies aged 77
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