Can't find a movie that i remember

There was a movie about a serial killer. he died couple of years ago but he also was a cop. his wife is still living. his wife and a cop was a teammate and they kidnapped some tourist. they had a some torture on them and they make a tape. and the woman still watching this tape. woman has a red mask. and we have a couple that decided to make a documentory about it.

Which movie is it. I’m bout to lose my mind.

That sounds very familiar to an TV episode of Black Mirror, Season 6
called Loch Henry.
about serial torturers capturing tourists in a Scottish village
and then the making of a documentary 20 years later.
It was on Netflix in 2023.

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