LONDON - Dolores O'Riordan, lead singer of Irish band The Cranberries, has died at 46. The Limerick band became well-known internationally in the 1990s with hits including "Zombie" and "Linger."

Publicist Lindsey Holmes says O'Riordan died suddenly Monday in London, where she was recording. The cause of death wasn't immediately available.

Holmes says the singer's family is "devastated" by the news.

Get Breaking News Delivered to Your Inbox

O'Riordan was still active in her career, performing as recently as December, according to The Cranberries' social media accounts. In November, she recorded the theme song for a short film called "Angela's Christmas," which aired on Irish TV in December.

Last year, The Cranberries announced on social media that O'Riordan was having a tough recovery from an ongoing back problem, forcing the band to cancel most of its European tour. However, in December, the singer tweeted, "Feeling good! I did my first bit of gigging in months at the weekend, performed a few songs at the Billboard annual staff holiday party in New York with the house band. Really enjoyed it!"

Musicians and fans mourned O'Riordan on Twitter.

Absolutely shocked to hear about the passing of Dolores O'Riordan! @The_Cranberries gave us our first big support when we toured with them around France years ago! Thoughts are with her family and friends — Kodaline (@Kodaline) January 15, 2018

Oh lord. Not Dolores O’Riordan. Grew up singing Cranberries songs. Tragic news. — Frank Turner (@frankturner) January 15, 2018

My heart hurts💔Just heard about Dolores. She was my childhood. Her voice timeless. My deepest condolences to her family and the band at this difficult time. RIP Dolores O’Riordan voice of an Irish angel. https://t.co/M0tbFJlOTT — KAYA 🇺🇸 www.KayaJones.com (@KayaJones) January 15, 2018