TV Tonight: A journalistic deep dive into the mind of a serial killer | television

Bewitched by the devil

9 p.m., Sky Crime
When 23-year-old Doug Gretzler was imprisoned in 1973 for the murders of 17 people over 20 days – including two children – in the United States, along with his accomplice Willie Stillman, the only person he spoke to was journalist Laura Greenberg, who recorded their conversations. This happened over an astonishing 350 prison visits and 500 hours of conversations. You open this documentary that questions the motives of the killers. Holly Richardson

Can you keep the secret?

9pm, BBC One
The quirky comedy rambles through a finale that conveniently ties together all the different ends of the blackmail/suspicious death. It begins with a nice bit of Mark Heap comedy, as the not-so-secretly dead William, husband of Dawn French’s Debbie, develops a taste for spoonfuls of dry cocoa powder. Jack Seale

Michael Jackson: The Trial

9pm on Channel 4
In the third episode of this four-part series revisiting the pop star’s 2005 trial for child molestation, the prosecution presents its case. Back in 1993, Jackson’s maid testifies that she saw him kissing a 13-year-old boy, but she was too afraid to tell the police, and there’s a shocking revelation from the boy’s mother. Ellen E. Jones

Surgeons: a matter of life and death

9pm on Channel 5
Great medical scenes end with this series as surgeons Andrew Kay and Richard Irving drill a hole in patient Abby’s skull in order to remove a tumor and a nerve in her brain. It’s exhausting viewing, although it’s impossible not to be in awe of the life-saving potential of modern science. Phil Harrison

Black ops

9.30pm on BBC One

MI5 enthusiasts Dom (Gbemisola Ikumelo) and Kay (Hamid Animashaun) make an even bigger mistake in a tangled plot that seems to be coming to a head. As the spy comedy series comes to an end, can the rookie agents foil a devious attempt to sabotage the Notting Hill Carnival? Graeme Virtue

First Dates: Be My Darling

At 10pm on Channel 4
Gogglebox fans will cheer on former star Daniel as he sits down to dinner with a paramedic in the Valentine’s Day special. Elsewhere in the restaurant, Patrick, a Girls Aloud fan, is searching Something kinda ohWhile a dentist who enjoys rap music wants someone who makes him smile. Human resources