(KRON) -- Legendary guitarist Bob Weir, founding member of the Grateful Dead and Dead Company, has died, according to a statement posted Saturday by his family on his official Instagram page. He was 78. "It is with profound sadness that we share the passing of Bobby Weir," the statement read. "He transitioned peacefully, surrounded by loved ones, after courageously beating cancer as only Bobby could. Unfortunately, he succumbed to underlying lung issues." The post said Weir was diagnosed in July and underwent treatment weeks before returning to the stage for a three-night celebration marking 60 years of music at San Francisco's Golden Gate Park. The statement continued, "Bobby’s final months reflected the same spirit that defined his life. Diagnosed in July, he began treatment only weeks before returning to his hometown stage for a three-night celebration of 60 years of music at Golden Gate Park. Those performances, emotional, soulful, and full of light, were not farewells, but gifts. Another act of resilience. An artist choosing, even then, to keep going by his own design. As we remember Bobby, it’s hard not to feel the echo of the way he lived. A man driftin’ and dreamin’, never worrying if the road would lead him home. A child of countless trees. A child of boundless seas." "There is no final curtain here, not really. Only the sense of someone setting off again. He often spoke of a three-hundred-year legacy, determined to ensure the songbook would endure long after him. May that dream live on through future generations of Dead Heads. And so we send him off the way he sent so many of us on our way: with a farewell that isn’t an ending, but a blessing. A reward for a life worth livin’." San Francisco Mayor Daniel Lurie posted a tribute on X, saying, "San Francisco mourns the loss of Bob Weir. Bob and the Grateful Dead helped build connection across generations, and his legacy will live on in San Francisco. Bob's return to Golden Gate Park this past summer brought out the best of our city — music, community, and joy. My heart goes out to Natascha, Monet, Chloe, and all who loved him." There is a growing memorial outside the Grateful Dead House, located in San Francisco's Haight-Ashbury District. Photo: KRON4 News. Tributes are pouring in from fans on social media with several featured below: This is heartbreaking. Love you forever, Bobby. Thank you for everything. 💔  Man. Eternally grateful for the world you built Bobby and that it will continue to live on forever through the music.  You’re the man, Bobby RIP to an absolute legend. 💔 Thank you for a real good time. Your beautiful voice and music will be heard for hundreds of years to come. This story will be updated. ...read more read less