What I couldn't understand is how the poor girl went missing around the 15th December but her mum, dad and sisters didn't realise and report she was missing until the new year. Didn't they ring her even on Christmas Day to wish her a happy Christmas?
Also, Although there was a lot of circumstancial evidence, there was nothing cocrete to pin on him, and the documentary said it took over a year to amass enough evidence to prsent a case. This included things like missed appointments at the hairdressers and dentists in the interim period between the last confirmed sighting, 15.12 (as I say, I might be a day or two out there) and Xmas Day, the date Quy alleged she walked out. Now, I would have thought trying to turn information up like that would be pretty basic investigative work. Why did it take them in excess of a year to establish this?
Finally, it's chilling to think that if Quy hadn't cracked and finally confessed, he may well have got away with it, because how could they have proved beyond reasonable doubt that he definitely killed her (no body, no weapon, no witnesses to the killing etc)?