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

The Man in the Mask: A Murder in Orkney

9 p.m., BBC two
In 1994, 26-year-old Shamsuddin Mahmoud was shot dead while serving food at an Indian restaurant in Orkney. Fourteen years later, teenager Michael Ross was convicted of the murder. Ross still denies it, and speaks from prison in this true crime series. As journalist Hazel Martin re-evaluates the events, she also speaks with Mahmoud’s family, Ross’s mother and some of those who worked on this horrific case. Holly Richardson

Celebrity racing around the world

8pm, BBC One

The backpacking rush along Central America’s Pacific coast is at the halfway point. Our four adorable duos must make their way through Costa Rica to reach Panama. Highlights include DJ Tyler West’s OTT set of LED flares and Roman Kemp’s hair looking “a little bit Ace Ventura.” Graeme Virtue

Cancer Investigators: Finding the Cure

9pm on Channel 4
Narrated by Lenny Henry, this stunning series offers a glimpse into those at the forefront of cancer research. For Cambridge neurosurgeon Richard Meier, speed is key to treating malignant brain cancers. Improving the analysis of tumor DNA means that effective drugs can be administered as quickly as possible to those taking part in its trials. JV

Death of Bunny Monroe

9pm, Sky Atlantic
Matt Smith’s increasingly insufferable hero, Bunny Munro, is haunted by his wife’s suicide as he continues his version of caring for their young son in this adaptation of Nick Cave’s controversial novel. This involves making Bunny Jr wait in the car while he attracts women with his makeup products. Human resources

ridge

9.45pm, BBC2

Despite (or perhaps because of) a close-knit New Zealand community being torn apart like an opioid-addicted hurricane, Scottish paramedic Mia (Lauren Lyle) gets closer to the truth about her sister’s fatal climbing accident. But by mixing in local secrets, will she alienate everyone who could help her? JV

Australian survivor

10.10pm, BBC 3
The hit Australian survival show is in its ninth series – and in the wilderness of Charters Towers, Queensland, it’s more action-packed than ever. The opening double bill introduces us to 12 pairs of contestants, before the first tribe vote sends someone packing. Human resources