Police in London are investigating the circumstances surrounding the sudden death of singer Dolores O'Riordan.
A statement issued by Scotland Yard this evening said police officers in Westminster were called to a hotel in Park Lane in London at approximately 9.05am today.
"A woman in her mid 40s was pronounced dead at the scene.
"At this early stage the death is being treated as unexplained. Enquiries continue."
A spokesperson confirmed to independent.ie that the circumstances surrounding her death are being investigated.
The Cranberries frontwoman was in London for a short recording session and had suffered from ill health in recent times, according to a statement issued on behalf of her family.
No further details are available at this time.
In a short statement, it said that family members are "devastated" to hear the breaking news and have requested privacy at this very difficult time.
A spokeswoman for London Hilton, on Park Lane, said: "It is with deep regret that we can confirm a guest sadly passed away at the hotel on Monday 15th January.
"We offer our sincere condolences to their family at this difficult time.
"Team members acted swiftly to alert the Metropolitan Police and we are cooperating fully with their investigation.
"All further enquiries should be directed to the police."
The Cranberries were one of Ireland's biggest bands of the last 20 years.
Formed in the late 1980s, they shot to fame after their debut album 'Everybody Else Is Doing It, So Why Can't We' was released in 1993.
The band have sold over 40million records worldwide.
Born and raised in County Limerick, Dolores O'Riordan was still in her teens when she answered an advert for a female singer for a rock band called The Cranberry Saw Us.
Having written her own songs since she was 12, she tried out for the group by showing off both her lilting vocals and her ability to pen melodies and words for their demos.
Existing members Mike and Noel Hogan and Fergal Lawler snapped her up and together they became The Cranberries, increasingly becoming known for O'Riordan's distinctive voice.
One of the demos she had worked on for her audition was Linger, which gave The Cranberries a number three hit in Ireland in 1993 and proved to be their breakthrough track. More success followed with songs such as Salvation and Zombie, which scooped a coveted Ivor Novello Award.
They unveiled their debut studio album - entitled Everybody Else Is Doing It, So Why Can't We? - in 1993 and it topped the charts.
Successful follow ups No Need To Argue and To the Faithful Departed came in 1994 and 1996, cementing the band's status as a mainstream international rock band. To date the group has sold over 40 million records.
But by 2003 it was time for a change and the band announced they were taking some time off to pursue other opportunities.
O'Riordan seized the opportunity to pursue a solo career and released the albums Are You Listening? (2007) and No Baggage (2009).
But while her musical ventures thrived, the singer was battling depression and mental health troubles in her personal life.
In an interview in 2013 she said she had been abused as a child which she said later led to an eating disorder and a breakdown.
"I had anorexia, then depression, a breakdown," she said.
"I knew why I hated myself. I knew why I loathed myself. I knew why I wanted to make myself disappear."
O'Riordan married Don Burton, the former tour manager of Duran Duran, in 1994 and they had three children.
Her family, she said, were her "salvation".
But there was more heartbreak ahead, with the singer losing her beloved father in 2011 and her marriage coming to an end in 2014.
Two years later O'Riordan was ordered to pay €6,000 to charity for headbutting, kicking, hitting and spitting on police officers following an alleged air rage incident.
The singer had previously admitted three assaults and obstructing a garda after being taken off an Aer Lingus flight from New York's JFK to Ireland in November 2014.
Medical reports produced for the trial at Ennis District Court revealed she had been suffering from mania, mental illness and severely impaired judgement at the time of the incident, and that she remembered nothing about it.
Last year she revealed she had been diagnosed with bipolar disorder in 2015.
She told Metro: "There are two ends of the spectrum - you can get extremely depressed and dark and lose interest in the things you love to do, then you can get super manic.
"I was at the hypomanic side of the spectrum on and off for a long period but generally you can only last at that end for around three months before you hit rock bottom and go down into depression. When you're manic you don't sleep and get very paranoid."
The star said she was dealing with it with medication.
In another revealing interview O'Riordan told the Irish News that depression "whatever the cause, is one of the worst things to go through", but that her family had given her happiness.
"I've also had a lot of joy in my life, especially with my children," she said.
"You get ups as well as downs. Sure isn't that what life's all about?"