ITV has viewers gripped with its dramatisation of the 2011 disappearance and murder of 22-year-old Sian O’Callaghan in A Confession.

And it's now the FINAL episode of the series TONIGHT. But who's in the cast of the thrilling drama? Find out below...

6 You can't miss new ITV show A Confession

Who is in the cast of A Confession?

The star line-up includes:

Martin Freeman

6 Martin Freeman takes on the lead role of Detective Superintendent Steve Fulcher Credit: ITV

Martin Freeman, 47, will play the part of Detective Superintendent Steve Fulcher.

This isn't the first time he's played a sleuth - he starred as Dr. John Watson in the series Sherlock alongside Benedict Cumberbatch.

Other series he's starred in include The Office and Fargo.

He's also been in a number of films including The Hobbit, Love Actually and Black Panther.

Siobhan Finneran

6 Siobhan Finneran takes on the role of Elaine O’Callaghan Credit: ITV

Siobhan Finneran, 52, will play the part of Sian's mother Elaine.

She previously starred in Downtown Abbey as the scheming lady's maid Sarah O'Brien.

The actress has also been in Coronation Street, Happy Valley and The Amazing Mrs Pritchard.

In the hit ITV comedy Benidorm she played Janice Harvey.



Imelda Staunton

6 A-list actress Imedla Staunton plays Karen Edwards Credit: ITV

Imelda Staunton, 63, is playing the role of Karen Edwards, a mother whose daughter Becky previously disappeared.

She's previously starred in a number of film and theatre roles.

In Nanny McPhee she played Mrs. Blatherwick and in two of the Harry Potter films she starred as Dolores Umbridge.

Her TV credits include Return To Cranford, My Family and Other Animals and Up The Garden Path.



Joe Absolom

6 Joe Absolom plays Christopher Halliwell Credit: KUDOS/Itv

Joe Absolom, 40, plays the role of chief suspect and local taxi driver Christopher Halliwell.

He is best known for playing Matthew Rose in EastEnders from 1997 to 2000.

The actor also played Al Large in Doc Martin alongside Martin Clunes.

Other TV credits include The Bill, Dangerfield and Silent Witness.



Charlie Cooper

6 Charlie Cooper (seen on the front row, left) plays Kevin Reape.

Charlie Cooper will play Sian's boyfriend Kevin Reape.

He previously starred in and co-wrote the BBC mockumentary This Country with his sister Daisy May Cooper.

The TV star won an award for Breakthrough Talent at the 2018 Bafta Craft Awards.

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What is A Confession about?

Following on the success of Manhunt, A Confession is another crime drama which deals with a real-life case.

It tells the story of 22-year-old Sian O’Callaghan, who went missing in Swindon in 2011 after leaving a nightclub to walk to her boyfriend's house.

Senior Investigating Officer Steve Fulcher is in charge of handling the case and firmly believes that Sian is still alive.

In the end he links Sian's case to the disappearance of Beck Edwards and breaches police procedure to ensure that justice prevails.

You can catch it TONIGHT (Monday, September 24, 2019) on ITV at 9pm.