Dolores O'Riordan, the lead singer of rock group The Cranberries, has died suddenly at the age of 46, Irish media have reported.
Irish state broadcaster RTE said the singer died in London while there for a recording session.
Her publicist said her family were shattered by the news.
The Irish musician, originally from Limerick, led the band to international success in the 1990s with singles including Linger and Zombie.
In 2017 The Cranberries announced a tour including dates in Europe, the UK, and the US.
However, in May 2017, shortly into the European tour, The Cranberries had to cancel the remainder of the European dates as a result of O'Riordan's health issues.
The official Cranberries website cited these issues as being problems with the singer's back.
But just before Christmas O'Riordan had posted on Facebook saying she was "feeling good" and had done her "first bit of gigging in months", leading fans to believe she would soon be performing again.
O'Riordan tweeted a picture of herself with her cat to fans in early January saying she was "off to Ireland".
O'Riordan split from her husband of 20 years, Don Burton in 2014. Together with Burton, who is the former tour manager of Duran Duran, they have three children.
The singer suffered from bi-polar disorder and was spared a criminal conviction after an air rage incident in 2014.
The Cranberries shot to international fame with their 1993 debut album Everybody Else Is Doing It, So Why Can't We? and went on to sell over 40 million records worldwide.