Sinéad O’Connor photographed in October 1988. Photo by Kevin Cummins/Getty Images.

Irish singer Sinéad O’Connor died Tuesday at 56.

No cause of death was immediately announced for O’Connor, who was as known for her voice and her cover of Prince’s “Nothing Compares 2 U” as for her feud with the Catholic Church and her lifelong mental health struggles, about which she often spoke publicly.

Earlier in July, she wrote on social media that she had returned to London after more than two decades and was finishing an album that would be released next year.

Sinéad O’Connor performs at Paradiso in Amsterdam, Netherlands on March 16, 1988. Photo by Paul Bergen/Redferns.

Despite a troubled childhood—she has said that after her parents’ divorce, her mother abused her—Sinéad O’Connor showed promise as a vocalist from a young age, moving to Dublin to pursue a music career. Her 1987 debut album, The Lion and the Cobra, was certified gold and was nominated for a Grammy award for best female vocal rock performance.

Her next album, I Do Not Want What I Haven’t Got, featured her arrangement of “Nothing Compares 2 U,” which was nominated for three Grammys including record of the year, and won for best alternative music performance.

O’Connor released eight more albums and received more Grammy nominations, but became more known for her outspokenness. In 1993, ripped up a picture of the Pope while performing on “Saturday Night Live” to protest against sexual abuse within the Catholic Church.

Sinead O’Connor performs at August Hall in San Francisco on Feb. 7, 2020. Gary Chancer/STAFF.

In 2007, she revealed that she had been diagnosed with bipolar disorder and had attempted suicide in 1999, on her 33rd birthday. In 2015, she was briefly the subject of a welfare check search after posting online that she had overdosed after an argument with her ex-husband, the father of her youngest son, Shane. She received medical attention at the time, it was reported. Shane died by suicide in 2022 at 17. O’Connor shared several more times online that she was struggling with mental illness and publicly asked for help.

In 2018, O’Connor changed her name to Shuhada Sadaqat and converted to Islam. Among her last posts on social media was a July 17 Tweet in which she expressed sorrow at the loss of Shane.

“He was the love of my life, the lamp of my soul. We were one soul in two halves. He was the only person who ever loved me unconditionally,” she wrote.

O’Connor’s final performance in the Bay Area came shortly before the pandemic, in February 2020. She is survived by three children.

😭😭😭😭😭😭😭😭😭😭#lostmy17yrOldSonToSuicidein2022.
Been living as undead night creature since. . He was the love of my life, the lamp of my soul. We were one soul in two halves. He was the only person who ever loved me unconditionally. I am lost in the bardo without him pic.twitter.com/aC8BOmLQ9N

— Sinead Marie-Bernarde Aoibheann O’Connor (@786OmShahid) July 17, 2023