Lou Koller, the co-founder and longtime frontman of the influential New York hardcore band Sick of It All, died Friday at the age of 59. The cause was a two-year battle with esophageal cancer.
The band announced Koller’s death in a statement posted to Instagram, calling him "a beloved friend and an iconic frontman" whose loss is "overwhelming."
Sick of It All, which would have celebrated its 40th anniversary this year, is considered a seminal act in the New York hardcore scene. Koller's "camaraderie, commitment and enthusiasm were always steadfast throughout the years," the band stated.
Koller first disclosed his cancer diagnosis in June 2024, sharing that a tumor in his esophagus had spread to his stomach. This led to the cancellation of the band's European tour to allow him to undergo treatment. In May 2025, Koller announced he was cancer-free following chemotherapy. However, the cancer returned just a few months later.
Throughout his illness, fans and fellow musicians offered support through benefit concerts and fundraisers to assist with medical expenses. Sick of It All expressed gratitude to supporters, noting they helped Koller "feel very special and very loved" during his final years. "His battle is over now and he can finally rest," the band wrote. "Hopefully he can somehow still see and feel the beautiful, positive mark he left on the world."
Born and raised in Queens, New York, Koller formed Sick of It All in 1986 with his brother Pete Koller and drummer Armand Majidi. The group went on to release 12 studio albums and built a dedicated international following.
Tributes have poured in from the music community and beyond. WWE star CM Punk shared his condolences on Instagram, writing, "Love you Lou and SOIA. Thank you for the soundtrack for my life. Sending hugs."