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Popular ’90s music group member Brian “Brizz” Gillis of LFO suddenly died from an unknown cause. He was just 47.

The music group created the smash hit “Summer Girls” and was signed to the same record label as NSYNC and Backstreet Boys.

Gillis founded the band with two others in 1995.

They achieved stardom as their popular hit became known as “the Abercrombie & Fitch song.”

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Gillis left the group just before that success came, and he was replaced by Devin Lima. They went on to release another hit, “Girl on TV,” with a music video that starred Jennifer Love Hewitt.

Although the group members were just in their 20s during their heyday, Gillis is actually the third member of LFO to pass away.

Cronin died in 2010 after battling leukemia. He had a stroke after taking a medication to help him recover from complications from a stem cell transplant. He was 36.

Lima died in 2018 of stage 4 adrenal cancer. He was 41.

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Fischetti, the last surviving member of LFO, posted a tribute to Gillis on his Instagram page.

“Every story is made up of chapters,” he began. “Some develop naturally. Some you have to cut up in your mind. The first two chapters of the LFO story lost a main character yesterday.