The keyboard player, who was a member of the Small Faces and the Faces, was admitted to an Austin, Texas hospital after suffering a stroke.
The 69 year old joined the Small Faces in 1965 and became a member of the Faces when singer Steve Marriott left and Rod Stewart and Ronnie Wood joined the band. He also would often join Wood on Rolling Stones tours.
Stewart tells NME.com, "I'm absolutely devastated. Ian MCLagan embodied the true spirit of the Faces. Last night I was at a charity do, Mick Hucknall was singing I'd Rather Go Blind, and Ron Wood texted to say Ian had passed. It was as if his spirit was in the room. I'll miss you, mate."
Wood took to his Twitter.com page to pay tribute to both MCLagan and Rolling Stones saxophone player Bobby Keys, who died on Tuesday (02Dec14).
Wood writes, "God bless Bobby and Mac."
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