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Late Smash Mouth singer Steve Harwell performs with the band in Anaheim, Calif., Sept. 29, 2008.Matt Sayles/The Associated Press

Steve Harwell, the long-time frontman of the Grammy-nominated pop rock band Smash Mouth that was behind the megahit All Star has died. He was 56.

The band’s manager, Robert Hayes, said Harwell “passed peacefully and comfortably” Monday morning surrounded by family and friends at his home in Boise, Idaho. The cause of death was acute liver failure, Hayes said in a statement.

Smash Mouth is also known for hits including Walkin’ on the Sun and Then The Morning Comes.

“Steve Harwell was a true American Original. A larger than life character who shot up into the sky like a Roman candle,” Hayes said. “Steve should be remembered for his unwavering focus and impassioned determination to reach the heights of pop stardom.”

Born in California in 1967, Harwell performed in a rap group called F.O.S. (Freedom of Speech) before forming Smash Mouth in 1994. The band released two platinum albums on Interscope Records, the ska-fuelled 1997′s Fush Yu Mang and 1999′s Astro Lounge. The second album featured some of the band’s biggest hits, including the Grammy-nominated, platinum single All Star, which appeared in the movie Shrek alongside their cover of the Monkees’ I’m a Believer.

Humour was a driving force behind Smash Mouth’s success, and at the forefront was Harwell’s playful alt-rock voice and persona. He made a cameo in 2001 comedy film Rat Race, and had a well-documented friendship with the Food Network chef and host Guy Fieri.

Steve lived a 100% full-throttle life. Burning brightly across the universe before burning out,” Hayes said.

“He will be greatly missed by those who knew and loved him,” he said.

Harwell retired from performing and left Smash Mouth in 2021. The band continued to tour with Zach Goode as the singer. Smash Mouth released a statement at the time saying Harwell had been diagnosed with cardiomyopathy eight years earlier and had suffered “non-stop serious medical setbacks including heart failure as well as acute Wernicke Encephalopathy.”

Hayes had released a statement on Sunday saying Harwell was in hospice care.

Harwell will be cremated in Boise and buried in San Jose, California, alongside his mother, Hayes said.

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