TV tonight: the extraordinary story of the 1994 murder that shocked Orkney

The Man in the Mask: An Orkney Murder

9pm, BBC Two
In 1994, 26-year-old Shamsuddin Mahmood was shot dead as he served food in an Indian restaurant in Orkney. Fourteen years later, teenager Michael Ross was found guilty of the murder. Ross still denies it, and he speaks from prison in this true-crime series. As journalist Hazel Martin re-evaluates events, she also talks to Mahmood’s family, Ross’s mother and some of those who worked on the shocking case. Hollie Richardson

Celebrity Race Across the World

8pm, BBC One

Molly Rainford and Tyler West in Celebrity Race Across The World. Photograph: Studio Lambert/BBC/PA

The backpacking dash down the Pacific coast of Central America reaches its halfway point. Our four likable duos must navigate their way through Costa Rica to reach Panama. Highlights include DJ Tyler West’s OTT collection of LED torches and Roman Kemp’s hair going “a bit Ace Ventura”. Graeme Virtue

Cancer Detectives: Finding the Cures

9pm, Channel 4
Narrated by Lenny Henry, this eye-opening series profiles those at the cutting edge of cancer research. For Cambridge neurosurgeon Richard Mair, speed is the key to tackling insidious brain cancers; optimising the analysis of tumour DNA means effective drugs can be given as soon as possible to those taking part in his trials. GV

The Death of Bunny Munro

9pm, Sky Atlantic
Matt Smith’s increasingly unbearable antihero Bunny Munro is haunted by his wife’s suicide, as he continues his version of looking after their young son in this adaptation of Nick Cave’s contentious novel. That involves making Bunny Jr wait in the car while he woos women with his makeup products. HR

The Ridge

9.45pm, BBC Two

Mia (Lauren Lyle) is getting closer to discovering what happened to her sister. Photograph: Great Southern Studios/Sinner Films/BBC Scotland/Sky New Zealand Originals

Despite (or perhaps because of) ripping through a close-knit community in New Zealand like an opioid-addicted hurricane, sweary Scottish medic Mia (Lauren Lyle) is getting closer to the truth about her sister’s lethal climbing accident. But by churning up local secrets, is she alienating everyone who could help her? GV

Australian Survivor

10.10pm, BBC Three
The hit Aussie take on the survival show reaches its ninth series – and in the wilderness of Charters Towers, Queensland, it’s as action-packed as ever. The opening double bill introduces us to the 12 pairs of contestants, before the first tribe vote sends someone packing. HR