News of the musician's death was announced via Babyshambles' official Facebook page.
A statement from band members Pete Doherty, Drew McConnell, Mick Whitnall and Adam Ficek read: "It is with deep regret and sadness that we share the news of Patrick Walden's death.
"We feel very fortunate to have known, loved and worked with him and we kindly ask for respect and privacy during these difficult times.
Walden performed in a variety of bands - including Fluid, the Six Cold Thousand, and The White Sport - before he joined Babyshambles back in 2003.
The rock group - formed by Doherty during a hiatus from the Libertines - released three albums together, including Down in Albion in 2005, Shotter's Nation in 2007 and Sequel to the Prequel in 2013.
The Libertines re-formed in 2014, but Babyshambles continued to perform sporadic shows and festivals throughout that year.
In 2024, Doherty revealed that a Babyshambles reunion was on the cards to mark the 20th anniversary of their debut album.
He told NME at the time: "But it's the who and the when that needs to be worked out. I think we'll just keep that one on the horizon and deal with that one next year."
Meanwhile, Walden also worked as a live guitarist and as a session musician for a number of well-known artists, including James Blunt and Whitey.
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