Lou Koller, the frontman and co-founder of the New York hardcore band Sick of It All, dies at age 59, according to multiple outlets citing statements from the band. The band announces his death on Friday, shortly before the group’s planned 40th anniversary. Coverage describes a cancer diagnosis reported in 2024 and a subsequent period of treatment. Rolling Stone says that in June 2024 Koller told fans doctors found a tumor in his esophagus and he would undergo treatment. Several reports characterize the illness as cancer, with some specifying adenocarcinoma. Other outlets describe it as a roughly two-year health battle. The Guardian similarly reports that he had been battling esophageal cancer, and notes the announcement is made by bandmates via the band’s social media channels. While outlets differ slightly in medical wording and timeline emphasis, they agree on the core details: Koller’s role as the band’s lead singer, his death at 59, and that his passing follows an extended cancer illness that became public in 2024. Tributes from the band reflect the loss the group says it feels at the time of his death.