The catfish who hooked a murderer

Lehanne Sergison posed as someone else on social media to trap her aunt Christine Robinson's killer

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When Christine Robinson was brutally murdered in her home in South Africa, her niece Lehanne Sergison vowed to get justice.

However, when the main suspect was seen on CCTV heading for the Zimbabwean border, police told her there was nothing they could do.

Now, a new Prime Video documentary recounts how Lehanne spent six years tracking down her aunt's killer - all from her UK home, using Facebook to investigate.

"This lady on the phone said, 'Your aunt has been murdered,'" recalls Lehanne in the documentary. "This man raped and murdered my aunt but the chances of them finding him were nil."

The main suspect was a gardener called Andrew Ndlovu who fled the estate on the night of the murder.