Peter Tork, a member of the Monkees, has died at 77.

Tork had been battling adenoid cystic carcinoma, a rare cancer affecting his tongue, in 2009, his sister told the Washington Post.

“The Monkees” TV show ran from 1966-68. Lead singer Davy Jones died in 2012.

Surviving band members Michael Nesmith and Micky Dolenz have been performing past hits in “The Monkees Present: The Mike & Micky Show” tour. They’re scheduled to play at Lancaster’s American Music Theatre next month.

If the Monkees were a manufactured version of the Beatles, a "prefab four" who auditioned for a rock 'n' roll sitcom and were selected more for their long-haired good looks than their musical abilities, Tork was the group's Ringo, its lovably goofy supporting player.

On television, he performed as the self-described "dummy" of the group, drawing on a persona he developing while working as a folk musician in Greenwich Village, where he flashed a confused smile whenever his stage banter fell flat. Off-screen, he embraced the Summer of Love, donning moccasins and "love beads" and declaring that "nonverbal, extrasensory communication is at hand" and that "dogmatism is leaving the scene."

A versatile multi-instrumentalist, Tork mostly played bass and keyboard for the Monkees, in addition to singing lead on tracks including "Long Title: Do I Have to Do This All Over Again," which he wrote for the group's psychedelic 1968 movie, "Head," and "Your Auntie Grizelda."

At age 24, he was also the band's oldest member when "The Monkees" premiered on NBC in 1966. Not that it mattered: "The emotional age of all of us," he told the New York Times that year, "is 13."

Created by producers Bob Rafelson and Bert Schneider, "The Monkees" was designed to replicate the success of "A Hard Day's Night" and "Help!," director Richard Lester's musical comedies about the Beatles.

The band featured Tork alongside Nesmith, a singer-songwriter who played guitar, and former child actors Dolenz and Jones, who played the drums and sang lead, respectively. Like their British counterparts, the group had a fondness for mischief, resulting in high jinks involving a magical necklace, a monkey’s paw, high-seas pirates and Texas outlaws.

"The Monkees" ran for only two seasons but won an Emmy Award for outstanding comedy and spawned a frenzy of merchandising, record sales and world tours that became known as Monkeemania.

In 1967, according to one report in The Washington Post, the Monkees sold 35 million albums - “twice as many as the Beatles and Rolling Stones combined” - on the strength of songs such as “Daydream Believer,” “I’m a Believer” and “Last Train to Clarksville,” which all rose to No. 1 on the Billboard record chart.

For much of the 1970s, Tork struggled to find his own way. He formed an unsuccessful band called Release, was imprisoned for several months in 1972 after being caught with "$3 worth of hashish in my pocket," and worked as a high school teacher and "singing waiter" as his Monkees wealth dried up. He also said he struggled with alcohol addiction - "I was awful when I was drinking, snarling at people," he told the Daily Mail - before quitting alcohol in the early 1980s.

By then, television reruns and album reissues had fueled a resurgence of interest in the Monkees, and Tork had come around to what he described as the essential nature of the music group, which he joined for major reunion tours about once each decade, beginning in the mid-'80s, in addition to performing as a solo artist.

"This is not a band. It's an entertainment operation whose function is Monkee music," he told Britain's Telegraph newspaper during a Monkees tour in 2016. "It took me a while to get to grips with that but what great music it turned out to be! And what a wild and wonderful trip it has taken us on!"

He was born Peter Halsten Thorkelson in Washington, D.C., on Feb. 13, 1942. His mother was a homemaker, and his father - an Army officer who served in the military government in Berlin after World War II - was an economics professor who joined the University of Connecticut in 1950, leading the family to settle in the town of Mansfield.

Both parents collected folk records and bought him a guitar and banjo when he was a boy. Peter went on to take piano lessons and studied French horn at Carleton College in Northfield, Minnesota, where he reportedly flunked out twice before settling in New York City. At coffee shops and makeshift folk music venues, he performed with the shortened last name Tork, which had been emblazoned on one of his father's hand-me-down sweatshirts, according to the Los Angeles Times.

Tork played with guitarist Stephen Stills before moving to Long Beach, California, in 1965. Stills moved west as well and auditioned for "The Monkees" after the show's producers placed an advertisement in Variety calling for "4 Insane Boys, Ages 17-21."

When Stills didn't get the part - purportedly on account of his bad teeth - he suggested that Tork audition. "I went, 'Yeah, sure, thanks for the call,' and hung up," Tork later told the Los Angeles Times. "Then he called me a few days later," finally persuading Tork to try out.

He later appeared in episodes of television shows such as "Boy Meets World," playing the love interest Topanga's guitar-strumming father, and in recent years performed with a band called Shoe Suede Blues. Tork also released a well-received 1994 solo album, "Stranger Things Have Happened," and partnered with folk singer James Lee Stanley for several records.

Tork’s marriages to Jody Babb, Reine Stewart and Barbara Iannoli ended in divorce. Survivors include his wife, Pamela Grapes; a daughter, Hallie, from his second marriage; a son, Ivan, from his third marriage; a daughter, Erica, from a relationship with Tammy Sustek; a brother; and a sister.