Steve Harwell, the former lead singer of the rock band Smash Mouth, which was best known for its ubiquitous 1999 hit “All Star,” died Monday. He was 56.

       His death, at his home in Boise, Idaho, was confirmed by the band’s manager, Robert Hayes, who said the cause was liver failure.

       Smash Mouth was founded in 1994 in San Jose, California, and was made up of Harwell, the lead singer, Kevin Coleman on drums, Greg Camp on guitar, and Paul De Lisle on bass. The band first broke out with their 1997 song “Walkin’ on the Sun,” which appeared on their debut album, “Fush Yu Mang.”