Fieger, a Detroit-area native, formed The Knack in 1978. He co-wrote and sang lead vocals on "My Sharona," which held the No. 1 spot for six weeks. Fieger said the song was inspired by a former girlfriend.
The Knack's albums include "Get the Knack" and "... But the Little Girls Understand."
In 2006, Fieger underwent surgery to remove two tumors from his brain.