The 2x120mins event special is produced by Critical Content and distributed by Electus International, which struck the UK deal.
The show examines the infamous case of Ramsey, the six-year-old who was found dead in the basement of her Colorado home in 1996.
Her family was initially suspected, and it took until 2008 to completely clear them. The case reopened a year later, but has not been solved.
The show bowed on CBS and has since aired on Global in Canada and Network 9 in Australia.
“The story of the Ramsey family is one that is familiar to millions, arguably one of the most well-known cold cases in recent history,” said Tom Forman at Critical Content.
“Tapping into both the appetite for true crime programming as well as a genuine quest for the truth, this docuseries has recaptured the attention of the world.”