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Saturday magazine

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STV, 9pm THIS starts with a chilling 999 call. “I have a dead body here. It looks very nasty. She’s been strangled, I think. It’s my ex-wife. She’s got this cord round her neck. She’s cold, she’s dead.”

Sharon Birchwood, 52, was found strangled and tied up with parcel tape at her home in the leafy suburbs of Surrey in 2007.

Her ex-husband, Graham Birchwood, discovered her body and became the prime suspect.

But what followed next was one of Surrey Police’s most challenging murder investigations.

In a fascinating journey through the case, Susanna Reid has been given access to the police tapes that reveal the interviews and forensics.

The answers began in the country lanes of Surrey but led to VICTIM Sharon Birchwood the backstreets of Thailand and an entirely new suspect.

Along the way, Reid interviews key members of the police investigation team. DCI Maria Woodall says: “The length people will go to when it comes to murder still surprises me.” HUMANS

C4, 9pm A TENSE conclusion tonight to this unsettling drama about humans trying to co-exist with conscious robots.

Last we saw, Niska (Emily Berrington) collapsed in the woods – ran out of battery? – and was found by Odi. Now she’s being charged up in his remote shack in the forest and Niska wants to know who he really is.

Meanwhile, it’s a race against time to stop Basswood, and Laura (Katherine