LOS ANGELES -- It isn't easy being green. But no longer being green is apparently even harder.

Steve Whitmire, the puppeteer who was fired after 27 years as Kermit the Frog said Thursday he is "devastated to have failed" Muppets founder and his mentor Jim Henson.

Whitmire has been with the Muppets since 1978, and took over as Kermit after Henson died in 1990. He wrote an emotional blog post in response to his firing a day after it was made public.

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He said he was let go against his will, and would never have left voluntarily.

Muppet Kermit the Frog and his operator Steve Whitmire take questions from the audience at Barnes & Noble Lincoln Triangle on November 14, 2003,in New York City. Lawrence Lucier / Getty Images

"For me the Muppets are not just a job, or a career, or even a passion. They are a calling, an urgent, undeniable, impossible to resist way of life," Whitmire wrote. "This is my life's work since I was 19 years old. I feel that I am at the top of my game, and I want all of you who love the Muppets to know that I would never consider abandoning Kermit."

Whitmire said he was informed that Kermit would be recast in October, and has kept silent in the ensuing months in the hopes that he could get his bosses to change their minds. He said he offered "multiple remedies" to the reasons he was given for his firing.

He would not say what those reasons were, nor would Muppet Studio or its parent company Disney, who have not responded to requests for comment from The Associated Press.

Muppets Studio said in a statement to Time magazine that it "thanks Steve for his tremendous contributions to Kermit the Frog and the Muppets franchise. We wish him well in his future endeavors."

The Hollywood Reporter and ABC News reported Wednesday that longtime Muppets performer Matt Vogel will take over as Kermit.

Kermit was Henson's signature character, and the centerpiece of the Muppets franchise, from 1955 until 1990, and when he died it was unthinkable for many to imagine someone else doing it.

But Whitmire took up the role, and became the only Kermit many of today's young adults and kids have ever known. He was reportedly chosen by Henson's son, Brian, CBS New York reports.

The two made TV appearances on "Late Night with Jimmy Fallon," ''30 Rock" and "Saturday Night Live" and in films like "Muppets Most Wanted" and "The Muppets."

Addressing friends and fans, Whitmire wrote on his blog that "I just want you all to know that I am sorry if I have disappointed any of you at any point throughout our journey, and to let everyone know that I am devastated to have failed in my duty to my hero."