8pm, BBC Two
After more than two decades of planting, hedging and harvesting, it's finally time for Monty Don to hang up his trowel. Expect his final episode to have a bittersweet tone. However, gardening waits for no man: as Carol and Joe prove, from sowing to apple gathering, there's always work to be done.

Return to Paradise

7.30pm, BBC One
"My name is Viktor Sevchenko. I am an artist. And today, I die." And with that, he's stabbed through the heart in a grisly piece of performance art at Dolphin Cove art fair. But was his death a tragic accident? And why is he clutching a jelly baby? Mack (Anna Samson) investigates, kicking off an Australia-set season three double bill.

Unreported World: South Africa's Whistleblower Hitmen

7.30pm, Channel 4
An incredibly sinister story from South Africa: Darshna Soni explores the use of contract killers to silence whistleblowers, often including those making accusations of malfeasance connected to controversial government contracts. Soni speaks to a former hitman and to families who have lost loved ones.

The Walking Dead: Dead City

9pm, Sky One
As season three of the lurid zombie spin-off reaches its finale, former drinking buddies Dillard and Negan are on a collision course. Can a squirrelly dive-bar habitue really summon enough main character energy to take down one of the show's most notorious villains?

9pm, Sky Atlantic

A courtroom showdown looms as this delightfully juicy divorce drama approaches its endgame. And with Taylor and Byrne's case looking increasingly shaky, Molly smells a rat. Is Johnny's world about to come crashing down (again)? Dominic West and Sienna Miller are excellent, charismatic twin leads.

10.40pm, BBC
Graham welcomes Judi Dench (punting a memoir), Alan Cumming (returning to the stage) and Nicola Coughlan (promoting a new drama) into his inner circle. Music, and maybe a little Celebrity Traitors gossip, comes from James Blunt.

Film choice

In Korean director Lee Chang-dong's involving, edgy drama, documentary-maker Ye-ji (Cho Yeo-jeong) is attempting to make a film about factory workers sacked after a strike was violently broken by the state. She is particularly intrigued by the sullen, possibly traumatised Ho-seok (Sul Kyung-gu). He is resistant but Ye-ji develops a bond with his enthusiastic wife, Jeon Do-yeon's Mi-ok. As the parties get to know each other, with the addition of Ye-ji's wealthy spouse, Sang-woo (Zo In-sung), uncomfortable questions of class and exploitation swirl around them. Just as in his last film, 2018's Burning, Chang-dong has a sharp eye for what's hidden behind everyday lives.

Live sport

Ireland v Argentina 7.15pm, ITV1. From the Aviva Stadium, Dublin.