Hi 1stas. There was a great Jack the Ripper documentary in the 90's on Channel 4 called 'The Whitechapel Murders' as part of the Secret history Season. I looked up the year and it was 1996. There was also an ITV documentary called 'To kill and kill again' but that was 2001. As for the Carbon Monoxide documentary, that does ring a bell but not sure if that was part of the Secret History set. Hope this helps.