Bob Weir, Grateful Dead Co-Founder and Rhythm Guitar Icon, Dies at 78

Weir's family confirmed his death in a statement posted to social media, revealing that he had been diagnosed with cancer in July and began treatment just weeks before Dead & Company performed three nights at San Francisco's Golden Gate Park—shows that marked 60 years since the Grateful Dead's formation and became Weir's final performances.

"He transitioned peacefully, surrounded by loved ones, after courageously beating cancer as only Bobby could," the statement read. "Unfortunately, he succumbed to underlying lung issues."

Born in San Francisco in 1947, Weir crossed paths with banjo player Jerry Garcia as a teenager at Dana Morgan's Music Store, an encounter that led to the formation of the Grateful Dead. For three decades, his rhythm guitar work and songwriting helped define the band's sound and improvisational approach. After Garcia's death in 1995, Weir kept the Dead's legacy alive through groups including the Other Ones, Furthur, and Dead & Company, the latter featuring guitarist John Mayer.

Weir remained an evolving artist to the end. When I spoke with him last year just prior to Dead & Company's second Sphere residency, he described himself as perpetually changing. "I always do that," he said. "I wake up in the morning and I'm kind of different. You take all those mornings that I woke up kind of different and you add 'em together, and after a while, you start amounting to a different guy."

For the same story, Mayer, reflecting on a decade of performing alongside Weir, spoke of the profound impact of his musical approach. "The thing I've learned from Bob is to let it breathe," he said. "And that's changed my playing a lot."

"Bobby's final months reflected the same spirit that defined his life," his family wrote on social media. "Those [Golden Gate Park] performances, emotional, soulful, and full of light, were not farewells, but gifts. Another act of resilience."