Rex Features
The former Coronation Street actor will take on the role of Simon Turner, who arrives on the show this month as a clinical nurse manager.
His character will run a private minor injuries clinic within an NHS hospital, something that will put him at odds with the rest of the staff.
Fox played Mark Redman, the long-lost son of Mike Baldwin, in Coronation Street. He has also appeared in The Royal and Starhunter.
The character will make his first appearance on Casualty on May 31.
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