Eddie Marsan, 52, has been cast as a fraudster who faked his own death in 2002
The Darwins, who were both jailed, faked his death to claim insurance money
He was jailed after visiting a police station in 2007 saying he'd lost his memory
John, 70, had been travelling between Panama and a bedsit in County Durham
New ITV drama called The Thief, His Wife and the Canoe starts filming this month