He was a loner and a misfit who lived with his parents until his early 30s but went on to become a serial killer who stalked his victims on dating apps and gay hook-up sites.

But, Stephen Port was no cunning killer, and when he was tried for four murders in the Old Bailey the failings of police in their investigations into mysterious deaths in the Barking area of London was as stark as his horrific legacy of crimes.

Nicola Tallant chats with author Sebastian Murphy Bates, whose book 'Easy Kills' traces the story of Port and how police missed the blatant murders of gay men.

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