Karl Wallinger, who founded the band World Party, died on Sunday at the age of 66.

Wallinger’s family confirmed his death, according to The Los Angeles Times. No cause of death was given.

He joined the Waterboys as a keyboard player in 1984 and appears on two albums, “A Pagan Place” and “This Is the Sea.”

After leaving The Waterboys, Wallinger went on to found the pop-rock band World Party. The group’s first single, “Ship of Fools” was a top 40 hit in the U.S.

World Party’s second album, “Goodbye Jumbo” garnered critical acclaim with two of its songs — “Way Down Now” and “Put the Message in the Box.”

The rocker survived a brain aneurysm in 2001, which was misdiagnosed at the time, according to NPR, and put his career on hold for several years. Despite the health setback, Wallinger eventually released a compilation album, 2007′s “Best in Show.”

“Travel on well my old friend. You are one of the finest musicians I’ve ever known,” Waterboys frontman Mike Scott said on X, formerly known as Twitter.

Curt Smith of the band Tears for Fears paid tribute, writing “Very sad news, I was a big fan of Karl’s.”

Wallinger is survived by his wife Suzie Zamit, son Louis Wallinger, daughter Nancy Zamit and two grandchildren, according to The Independent.