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The show has long been sinister, but last night's case looking into the gaslighting greedy murderer Ben Field, sounded like it was on a whole new level.
The documentary looked into the story of university lecturer Peter Farquhar, 69, who was found dead in his home in Maids Moreton, Buckinghamshire in 2015.
Initially his death was not considered suspicious, but it was later revealed that he had in fact been killed by Field, an evil killer who tried to make his love-struck victims think they were the crazy ones.
And it has sent people wild.
One took to Twitter to say: "I think this is the most disturbing crime documentary I've ever watched. Thankfully the police are professional and compassionate.#CatchingAKiller"
Another added: "Astonishing work by @ThamesVP No sensationalism. Just thoroughly heartbreaking, compassionate, chilling tv".
A third commented: ""That video audio is one of the the most frightening things I have ever heard. And I've worked in forensic psychiatric units & studied psychoanalysis at university. I cannot bear the idea of this monster gaslighting these vulnerable older people".
A fourth echoed their sentiments: "Totally agreed. The video of Ben speaking to the care home resident and "programming" them was up there with the most chilling things I've seen."
Lastly, one added: "I've watched a lot of Crime Documentaries. But #channel4 #catchingakiller is going to take a while to shake off. Truly frightening."
The murder sounded so well planned, which is what makes it truly terrifying, especially as Field went on to gaslight his neighbour, Ann-Moore Martin too.
He actually scrawled messages across mirrors in her home to make her think she was receiving messages from god. She later tried to change her will to benefit Ben because of it. Sounds sickening.
If you want to catch up, the programme is available right now on 4oD for those that missed it and want to get stuck into a new true crime.
Prepare to be chilled.
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