A family continues its search for answers following a devastating killing. Plus: Hannah Fry investigates the future of superintelligence. Here’s what to watch this evening

9pm, BBC TwoIn 2005, Robert McCartney was beaten up and stabbed to death in a gang attack outside a Belfast city pub. After that, witnesses (there were about 70) remained silent and evidence was destroyed. But Robert’s five sisters and fiancee continued their fight for answers – including finding out what happened to a survivor of the attack. This documentary follows their journey. Hollie Richardson

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