Bob Weir, a founding member of the Grateful Dead, performs at the Farm Aid Music Festival in Noblesville, Indiana on September 24, 2023

Bob Weir, a founding member of the Grateful Dead, performs at the Farm Aid Music Festival in Noblesville, Indiana on September 24, 2023

 SUZANNE CORDEIRO

American guitarist and songwriter Bob Weir, a founding member of the revolutionary, psychedelic jam band Grateful Dead, has died aged 78, his family announced Saturday.

Weir was diagnosed with cancer in July and had beaten the disease, but "succumbed to underlying lung issues," his family said in a statement on his personal website, without specifying where or when he died.

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