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Bassist Bob Wasserman Passes

(CelebrityAccess) — Rob Wasserman, a bassist who was best known as a founding member of RatDog, has died. He was 64.

"One of the world's most beautiful friends and artists has left us. May Rob's warmth and music live in your hearts as it always has in mine," RatDog bandmate Bob Weir said via Twitter.

A cause of death for Wasserman was not disclosed, but he had previously revealed he was battling an undisclosed form of cancer. News of his passing came just hours after Weir tweeted that Wasserman was facing serious health issues.

A native of California, Wasserman started out with the violin but moved to the bass before he attended the San Francisco Conservatory of Music.

Over the course of his career, Wasserman collaborated with numerous artists, including Van Morrison, Metallica, Elvis Costello, Oingo Boingo, David Grisman, Branford Marsalis and Lou Reed.

As well, he also released five albums on his own, and had several writing credits to his name, including the Grateful Dead's "Eternity."

Wasserman leaves behind his wife, Veronica, as well as a daughter, sister, and brother. – Staff Writers