Grateful Dead bassist and co-founder Phil Lesh has died at the age of 84. According to a statement from his family, the musician “passed peacefully this morning (Oct. 25). He was surrounded by his family and full of love. Phil brought immense joy to everyone around him and leaves behind a legacy of music and love. We request that you respect the Lesh family’s privacy at this time.”

No cause was provided, although Lesh had a liver transplant in 1998 to combat hepatitis C and battled both prostate and bladder cancer over the years.

More from Spin:

BØRNS On the Beauty of Letting Go 

Tool Hosting Destination Festival In Dominican Republic

Primavera Sound 2025: Charli xcx, Chappell Roan, Sabrina Carpenter

Lesh met his future Dead bandmate Jerry Garcia in the Bay Area in 1959 and was a key contributor from day one amid their early experiments with LSD and associations with Ken Kesey’s acid tests in late ‘60s San Francisco, the turn toward Americana and recording of the Workingman’s Dead and American Beauty albums in the early ‘70s, the years spent on the road honing what was arguably the greatest live rock show in American history, the pop-cultural explosion of “Touch of Grey” in 1987 and the chaos and hedonism that followed the band in the ‘80s and ‘90s, and the slow, heartbreaking battles with illness and addiction that characterized Garcia’s final years before his 1995 death.

Long a proponent of the band’s LSD-fueled jams, Lesh co-wrote or sang lead on such Dead favorites as “Box of Rain,” “Unbroken Chain,” “St. Stephen,” “Truckin’” and “Cumberland Blues.” After the band wound down following Garcia’s passing, Lesh performed and toured constantly under the moniker Phil Lesh and Friends and was a staple of the jam band festival circuit.

Lesh’s final on-stage performance was on July 21 in San Rafael, Ca., when he and the Friends played a nearly song-for-song recreation of the Dead’s performance at the Hollywood Bowl in Los Angeles from exactly 50 years prior.

The news of his death comes just days after the Dead were named Kennedy Center honorees as well as MusiCares Persons of the Year for 2025.

This is a developing story.

To see our running list of the top 100 greatest rock stars of all time, click here.