Overview
- The band and his wife announced late Sunday, September 20, 2026, that Gilbert “passed away peacefully in his sleep” and that no specific cause of death was given.
- Gilbert had waged a public, years‑long battle with rare adrenal cancers that began with a metastatic pheochromocytoma in 2021 and was later described as stage 4 adrenocortical carcinoma after doctors found brain tumors in early 2026.
- Earlier this year he underwent emergency brain surgery to remove three tumors, returned to perform with New Found Glory in June from a mobility scooter, and contributed to the band’s February 2026 album Listen Up.
- He is survived by his wife Lisa Cimorelli, daughter Lily, mother Jackie and brother Brian, and the family said he took his final breaths with his wife and mother at his side.
- Peers and fellow musicians have paid tribute to Gilbert’s influence as a guitarist, songwriter and producer who helped shape the late‑1990s/early‑2000s pop‑punk scene, and the band has not yet announced funeral or memorial plans.