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It is shown tonight in a Channel 5 documentary tonight in the second part of a look back at the case.
Yesterday the moment Karen Matthews accidentally revealed she was involved in her daughter's disappearance emerged for the first time - as she was shown saying missing Shannon was 'in a nice warm environment'.
Detective Inspector Chris Walker said the remark, captured in a newly-uncovered video of an interview with Matthews in Dewsbury station, had immediately sounded alarm bells.
The incredible moment came as Matthews was officially identifying her newly-found daughter after she vanished weeks earlier. Pictured: The footage
Donovan, whose house she was discoved hidden, was in Halifax police station being booked in by officers when he lifts the lid off the whole mystery. Pictured: The footage