Rich Cronin, part of the pop music trio LFO, died Wednesday, according to E! Online. He was 35.

The singer wrote LFO's 1999 break-out hit "Summer Girls," which infamously gave a shout-out to "girls that wear Abercrombie & Fitch."

He had been battling myelogenous leukemia since 2005.

Cronin also starred on the VH1 series Mission: Man Band, where former boy band members tried to hit it big a second time around.

"Rip to a great friend rich c," Mission co-star Chris Kirkpatrick of *NSYNC said on his Facebook page Wednesday.

Cronin created the Cronin Hope Foundation to raise awareness about the disease and encourage others to become bone marrow donors.