The heart - wrenching documentary has attracted an outpouring of responses on social media and press attention. Here are just a few examples below...
KNOCK AT THE DOOR
What time is Catching a Killer: A Knock at the Door on Channel 4 tonight, who was Hang Yin Leung and what’s the documentary about?
Husband of murdered woman breaks down on Catching a Killer - but fans are livid no one was charged for the crime
Murder victim's grim account of her own death from beyond the grave is revealed in chilling documentary as police hunt six balaclava-clad thugs wanted after brutal home raid