Kim Shattuck, the singer-songwriter and lead guitarist for the punk rock band The Muffs, has died. She was 56.

Shattuck passed away on Wednesday morning after battling amyotrophic lateral sclerosis (ALS) for two years, her husband Kevin Sutherland confirmed on Instagram.

The Muffs Singer Kim Shattuck Dies at 56: She ‘Was a True Force of Nature’

Kim Shattuck Dies: Leader Of The Muffs And LA Music Stalwart Was 56

Kim Shattuck, Muffs Singer-Songwriter, Dies at 56

The Muffs’ Kim Shattuck Dead at 56

Kim Shattuck, Lead Singer and Songwriter of the Muffs, Dead at 56

Kim Shattuck, Lead Singer and Songwriter for The Muffs, Dies at 56