Singer Sinéad O'Connor, who became as well known for her remarkable music as her personal struggles, has died, according to RTE, Ireland's public broadcaster.

She was 56 years old. No cause of death was immediately available.

O'Connor's first album, "The Lion and the Cobra," was released to critical acclaim in 1987, but it was her 1990 sophomore album, "I Do Not Want What I Haven't Got," which broke her through as a well-known artist.

Her rendition of the Prince song "Nothing Compares 2 U" shot to No. 1 in 1990 and was nominated for multiple Grammys.

In the years following, O'Connor was embroiled in controversy, once ripping a photo of the pope on "Saturday Night Live." She later became a priest of a Catholic group and took to social media to air personal problems and outbursts.

In recent years, she was open about her struggle with addiction and mental health. Her 17-year-old son Shane died in 2022.

O'Connor appears on "The South Bank Show" in 1987. That year, she released her debut album "The Lion and the Cobra."
O'Connor appears on "The South Bank Show" in 1987. That year, she released her debut album "The Lion and the Cobra."
ITV/Shutterstock
O'Connor performs in Dublin, Ireland, in 1989. It was part of a gathering marking the 20th anniversary of a march on the British Embassy there.
O'Connor performs in Dublin, Ireland, in 1989. It was part of a gathering marking the 20th anniversary of a march on the British Embassy there.
Independent News and Media/Hulton Archive/Getty Images
O'Connor, who was born in Dublin in 1966, spoke often of her difficult childhood as the third of four children. She was sent away to reform school as a teenager after she was caught shoplifting. She turned to music for solace and was discovered at 15 while singing at a wedding.
O'Connor, who was born in Dublin in 1966, spoke often of her difficult childhood as the third of four children. She was sent away to reform school as a teenager after she was caught shoplifting. She turned to music for solace and was discovered at 15 while singing at a wedding.
Michel Linssen/Redferns/Getty Images
O'Connor performs at the Glastonbury Festival in England in June 1990. That year, her sophomore album "I Do Not Want What I Haven't Got" made her a star. It included her rendition of "Nothing Compares 2 U." It was nominated for multiple Grammy Awards.
O'Connor performs at the Glastonbury Festival in England in June 1990. That year, her sophomore album "I Do Not Want What I Haven't Got" made her a star. It included her rendition of "Nothing Compares 2 U." It was nominated for multiple Grammy Awards.
Mick Hutson/Redferns/Getty Images
O'Connor displays two of the three awards she won at the MTV Video Music Awards in September 1990. The video for "Nothing Compares 2 U," which featured O'Connor's close-cropped hair and a dark turtleneck, won MTV video of the year and best video by a female artist.
O'Connor displays two of the three awards she won at the MTV Video Music Awards in September 1990. The video for "Nothing Compares 2 U," which featured O'Connor's close-cropped hair and a dark turtleneck, won MTV video of the year and best video by a female artist.
Kevork Djansezian/AP
O'Connor speaks with actors Daniel Day-Lewis and Whoopi Goldberg at the Academy Awards Governors Ball in 1991.
O'Connor speaks with actors Daniel Day-Lewis and Whoopi Goldberg at the Academy Awards Governors Ball in 1991.
Bei/Shutterstock
In October 1992, O'Connor made headlines around the world after a controversial performance on "Saturday Night Live" in which she ripped a photo of Pope John Paul II in half while saying, "Fight the real enemy." The protest was lampooned, and it ultimately harmed O'Connor's career because of the outrage.
In October 1992, O'Connor made headlines around the world after a controversial performance on "Saturday Night Live" in which she ripped a photo of Pope John Paul II in half while saying, "Fight the real enemy." The protest was lampooned, and it ultimately harmed O'Connor's career because of the outrage.
NBC
Kris Kristofferson comforts Sinead O'Connor after she was booed during a Bob Dylan anniversary concert in New York in October 1992. This was a couple of weeks after the "SNL" protest.
Kris Kristofferson comforts Sinead O'Connor after she was booed during a Bob Dylan anniversary concert in New York in October 1992. This was a couple of weeks after the "SNL" protest.
Ron Frehm/AP
O'Connor is pictured with rockers Kurt Cobain and Courtney Love, along with their daughter, Frances, at the MTV Video Music Awards in September 1993.
O'Connor is pictured with rockers Kurt Cobain and Courtney Love, along with their daughter, Frances, at the MTV Video Music Awards in September 1993.
Kevin Mazur/WireImage/Getty Images
O'Connor performs with Peter Gabriel at a concert in Milwaukee in September 1993.
O'Connor performs with Peter Gabriel at a concert in Milwaukee in September 1993.
Paul Natkin/WireImage/Getty Images
O'Connor poses with Irish designer John Rocha in 1994.
O'Connor poses with Irish designer John Rocha in 1994.
Steve Wood/Shutterstock
O'Connor holds her daughter, Roisín, in 1995. Roisin was the second of her four children. She also had three sons: Jake, Shane and Yeshua.
O'Connor holds her daughter, Roisín, in 1995. Roisin was the second of her four children. She also had three sons: Jake, Shane and Yeshua.
Nils Jorgensen/Shutterstock
O'Connor made music for many years, releasing 10 studio albums spanning various styles and genres. But she never reached the commercial or critical success of her earlier work.
O'Connor made music for many years, releasing 10 studio albums spanning various styles and genres. But she never reached the commercial or critical success of her earlier work.
Richard Faulks/Camera Press/Redux
O'Connor, far right, joins other artists on stage at a London concert paying tribute to Paul McCartney's late wife, Linda, in April 1999.
O'Connor, far right, joins other artists on stage at a London concert paying tribute to Paul McCartney's late wife, Linda, in April 1999.
Dave Hogan/Hulton Archive/Getty Images
O'Connor is ordained as a priest in the Latin Tridentine church by the Rev. Michael Cox in April 1999. In 2014 she told Billboard she had stepped back from that office.
O'Connor is ordained as a priest in the Latin Tridentine church by the Rev. Michael Cox in April 1999. In 2014 she told Billboard she had stepped back from that office.
Michael Crabtree/PA Images/Getty Images
O'Connor holds her daughter, Roisín, during an anti-racism demonstration in Dublin in 2000.
O'Connor holds her daughter, Roisín, during an anti-racism demonstration in Dublin in 2000.
Reuters
O'Connor performs at the inauguration ceremony of the Library of Alexandria in Alexandria, Egypt, in 2002.
O'Connor performs at the inauguration ceremony of the Library of Alexandria in Alexandria, Egypt, in 2002.
Getty Images
O'Connor poses with reggae stars Sly & Robbie at the Mojo Awards in 2005.
O'Connor poses with reggae stars Sly & Robbie at the Mojo Awards in 2005.
Mick Hutson/Redferns/Getty Images
O'Connor poses with her pet dog at her home in County Wicklow, Ireland, in February 2012.
O'Connor poses with her pet dog at her home in County Wicklow, Ireland, in February 2012.
David Corio/Redferns/Getty Images
From left, Graham Norton, O'Connor, Daniel Radcliffe, Cuba Gooding Jr. and Omid Djalili appear on an episode of Norton's show in London in February 2012.
From left, Graham Norton, O'Connor, Daniel Radcliffe, Cuba Gooding Jr. and Omid Djalili appear on an episode of Norton's show in London in February 2012.
Ian West/PA Wire/AP
O'Connor performs in Amsterdam, Netherlands, in 2014.
O'Connor performs in Amsterdam, Netherlands, in 2014.
Paul Bergen/Redferns/Getty Images
O'Connor sings at a UFC event in Las Vegas in 2015. She performed the walkout song for Irish star Conor McGregor.
O'Connor sings at a UFC event in Las Vegas in 2015. She performed the walkout song for Irish star Conor McGregor.
Jeff Bottari/Zuffa LLC/Getty Images
O'Connor and blues musician Buddy Guy perform in Chicago in 2016.
O'Connor and blues musician Buddy Guy perform in Chicago in 2016.
Paul Natkin/Archive Photos/Getty Images
O'Connor appears at the Feile Music Festival in Thurles, Ireland, in 2019.
O'Connor appears at the Feile Music Festival in Thurles, Ireland, in 2019.
Debbie Hickey/Getty Images
O'Connor poses for a portrait in Los Angeles in 2020. In 2017, she changed her legal name to Magda Davitt, a name she took to be "free of parental curses." She changed her name again in 2018 to Shuhada' Davitt, after announcing her conversion to Islam following a series of posts at the time that included O'Connor singing the Islamic call to prayer.
O'Connor poses for a portrait in Los Angeles in 2020. In 2017, she changed her legal name to Magda Davitt, a name she took to be "free of parental curses." She changed her name again in 2018 to Shuhada' Davitt, after announcing her conversion to Islam following a series of posts at the time that included O'Connor singing the Islamic call to prayer.
Lindsey Best/The Washington Post/Getty Images