Sky Crime’s documentary looks back at a shocking 1970s crime spree. Plus: Dawn French and Mark Heap wrap up their secretive sitcom. Here’s what to watch tonight

9pm, Sky CrimeWhen 23-year-old Doug Gretzler was imprisoned in 1973 for murdering 17 people across 20 days – including two children – in the US, with his accomplice Willie Steelman, the only person he talked to was the journalist Laura Greenberg, who recorded their conversations. These took place across an astonishing 350 prison visits and 500 hours of conversation. She opens this documentary, which questions the murderers’ motives. Hollie Richardson

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