Boyzone singer Stephen Gately has died suddenly at the age of 33 while on holiday in Majorca.
Spanish police said he died on Saturday and that there were no signs of suspicious circumstances. But the cause of death is not yet known.
Gately was on holiday with his long-term partner Andy Cowles. His bandmates said they were "completely devastated" and are now travelling to Majorca.
The Irish band had six UK number one hits in the 1990s and reformed in 2007.
The four remaining members of Boyzone described Gately as "our friend and brother".
"We have shared such wonderful times together over the years and were all looking forward to sharing many more," a statement said.
"Stephen was a beautiful person in both body and spirit. He lit up our lives and those of the many friends he had all over the world. Our love and sympathy go out to Andrew and Stephen's family. We love you and will miss you forever."
Singer Ronan Keating is on his way back from the US and will join the rest of the group in Majorca.
Police said they were called to a house near Port d'Andratx on the western tip of the island on Saturday afternoon.
"At the moment it is not known how he died," the police spokesman said. "There are no signs of suspicious circumstances."
Boyzone manager Louis Walsh, who is still expected to appear as a judge on The X Factor results show on Sunday, told the News of the World newspaper: "We're all absolutely devastated.
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