Anlaf - Wikipedia has a quite long article about the death of Jane Longhurst, whose murderer claimed it was a case of "sex games gone wrong". I won't expand here, in case people would rather not read about the killer's previous activities and porn habits
The murderer of Charlotte Teeling also claimed it was "rough sex gone wrong"
As did the murderer of Karen Rae (as an aside - how great to see the headline on this article describe the killer as a misogynist)
The killer of Chloe Miazek picked up a woman who was so drunk that she had been thrown out of a nightclub in Aberdeen then had "rough sex gone wrong"

I'm quite horrified, in fact, just how many women are killed by strangulation. In the 5 mins that I've been googling, I've come across numerous articles about women strangled by their husbands (not during sex) and women strangled by their sons (ditto).
And where the defence is "rough sex gone wrong", it's striking how many cases involve couples who have only known each other for a very short time (a couple of hours, for example). I can't believe that any woman would agree to consensual breathing play with a stranger. And in many cases, their capacity to give consent to regular, vanilla sex was significantly impaired (usually through drink), but the prosecution seems to focus on a murder charge, not rape. I wonder if this is because murder is the greater charge in terms of sentence, and easier to prove?