O'Riordan was in London, where she was recording, when she died suddenly. The Cranberries Singer was just 46 when she passed away in London, while with her bandmates.
Dolores O'Riordan, who fronted the Irish alternative band the Cranberries that became an global sensation in the 1990s, died Monday.
On Monday, a statement was released to announce her death.
No further details are available at this time the cause of death has not been revealed.
"Family members are devastated to hear the breaking news and have requested privacy at this very hard time", the statement concluded.
The Cranberries - an Irish rock band former Limerick in 1989 - rose to fame in the "90s, after Dolores joined the group". The band went on to sell over 40 million records to become Ireland's second-best-selling rock band after U2.
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The band's popularity began to recede in the 2000s, and O'Riordan briefly embarked on a solo career in 2007, but reunited with the band in 2009. The Cranberries released the acoustic album "Something Else" in 2017 and had been due to tour Europe and North America.
"The outpouring of support The Cranberries have received from fans and followers during the past several months is greatly appreciated", the July statement from the group read.
In December, O'Riordan posted a message on the band's Facebook page. O'Riordan said depression "is one of the worst things to go through", but that "I've also had a lot of joy in my life, especially with my children".
I struck up a bond with Dolores that day as we chatted about her early life and times in Limerick for a feature in the Sunday World, and that warm, professional relationship continued in the interviews that followed through the decades.
They wrote: "Absolutely shocked to hear about the passing of Dolores O'Riordan!"
Irish singer and songwriter Hozier said the first time he heard O'Riordan's voice was "unforgettable" and he was "shocked and saddened" to hear the news. "I suppose when I was 5 years old, I spoke with a strong Irish accent, so I sang with one, too".