S Club 7 star Paul Cattermole has died at the age of 46, weeks after the band announced a comeback tour.
"It is with great sadness that we announce the unexpected passing of our beloved son and brother Paul Cattermole," a statement from his family and the pop group said.
He died on Thursday and the cause of his death is unknown but there are no suspicious circumstances, it said.
S Club 7 were one of the biggest pop acts of the late 1990s and early 2000s.
Their hits included Reach, Don't Stop Movin' and S Club Party. In total, they had 11 UK top 10 singles, including four number ones, and sold more than 10 million albums worldwide. They also won two Brit Awards.
The statement said: "While the cause of death is currently unknown, Dorset Police has confirmed that there were no suspicious circumstances. Paul's family, friends and fellow members of S Club request privacy at this time".
On social media, his bandmates said they were "truly devastated".
"There are no words to describe the deep sadness and loss we all feel," they wrote.
"We were so lucky to have had him in our lives and are thankful for the amazing memories we have.
"He will be so deeply missed by each and every one of us."
In February, the group announced a reunion tour, with 11 dates at arenas in the UK and Ireland scheduled for later this year.
Tributes have flooded in from fans and friends. TV and radio host Vernon Kay said the news of Cattermole's death was "so very sad".
Jeremy Edwards, former boyfriend of S Club 7's Rachel Stevens, wrote: "My thoughts and love go to all your friends and family."
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