Peter Tork, a member of The Monkees, died Thursday at 77 after a long battle with cancer.
His death was confirmed by sister Anne Thorkelson.
A cause of death was not disclosed but Tork was diagnosed a decade ago with adenoid cystic carcinoma, a rare form of cancer affecting the tongue.
"There are no words right now," tweeted bandmate Micky Dolez. "Heart broken over the loss of my Monkee brother, Peter Tork."
Born Peter Halsten Thorkelson, Tork was the oldest member of the made-for-TV pop band, which had hits like “I’m a Believer,” “Last Train to Clarksville” and “Daydream Believer.”
Tork, Dolenz, Michael Nesmith and Davy Jones didn’t start playing their own instruments until The Monkees had released two albums. At one time, the band sold more albums than the Beatles – the group they were create to spoof.
The Monkees TV series aired for only two seasons, from 1966 to 1968.
Tork quit the band in late 1968 but returned several times over the next few decades for reunions.
A message from the Peter Tork Facebook Team read: "It is with beyond-heavy and broken hearts that we share the devastating news that our friend, mentor, teacher, and amazing soul, Peter Tork, has passed from this world ... We ask for your kindness and understanding in allowing us to grieve this huge loss privately ... We want to thank each and every one of you for your love, dedication and support of our 'boss.' Having you in our world has meant so very much to all of us. Please know that Peter was extremely appreciative of you, his Torkees, and one of his deepest joys was to be out in front of you, playing his music, and seeing you enjoy what he had to share."
Tork is survived by fourth wife Pamela Grapes; daughter Hallie from his second marriage; son Ivan from his third marriage; and daughter Erica from a previous relationship.