The Undoing star Donald Sutherland says he always assumed his character was the killer

This article contains spoilers for The Undoing

The Undoing star Donald Sutherland has revealed that none of the cast knew who the show’s culprit was until they received the script for the finale.

Sutherland played the wealthy father of Nicole Kidman’s character, who grapples with her husband (Hugh Grant) being accused of murder in the thriller that gripped British viewers last year. Since the first episode, fans were speculating about who murdered Matilda De Angelis’s character.

Picking up a Critics Choice award for his role in the series on Sunday night (7 March), Sutherland said he seriously thought he was the killer for almost the entire shoot.

“The truth is we didn’t know,” he told press. “I always suspected that it was me. And maybe it was me.”

He added: “We didn’t get the 6th script until just before we shot it. Seriously. And then when I knew, the relief that it wasn’t me was so great that I didn’t want to say anything. Except that I’ve just said something.”

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In a three-star review for The Independent, critic Ed Cumming wrote: “The Undoing has the makings of a keen satire, in which these people slowly learn the extent of their self-deceit. As the plot starts to turn, however, and lawyers and policemen are involved, the programme’s satisfyingly deadpan touches are tangled up in its desire to be a more conventional thriller.

“The arrival of Edgar Ramirez as Detective Mendoza ought to inject pep, but instead you’re left with the sense that the cops are here to break up the party. Where Big Little Lies found a distinctive voice, The Undoing’s various virtuoso sections never quite play in concert.”

The Undoing was created by David E Kelley, whose other TV credits include Big Little Lies and Big Sky.

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The Undoing is currently available to watch on Now TV.