This isnt me, but my friend, you know.
This friend (Z) was in anóther city a few years ago, someone Z cared about, X, was almost engaged to someone, Y. They had their ups and downs in the relationship, but one day Z learned that Y had beaten X up, at least slapping and kicking which gave X a crack in a bone.
Now X was one of the only ones in the world that Z, at the time, was concerned about about. No, Z is not a psychopath but, however, according to Z's psychologist Z has an antisocial personality disorder. Anyway, having said this, Z was not happy when finding out. Their relationship ended, but Z was not satisfied.
Z went to Y, but Y was not home. Z visited Y's workplace - Y was not there, they said, but was getting food in KFC. Z saw Y's moped parked outside. On one side of the restaurant is a street corner and the other side is a dark alley, so Z dragged the moped there and put it there. Once there, Z stood against an opening so Z could not be seen if one looked down the alleyway, you could just see the moped. When Y noticed the theft, Y started shouting and swearing in their language, like "who touched the moped". As Y sees it in the alley, Y stops and then walks to it swearing. When Y stands at the moped Y is in front, but with the back towards Z.
Z threw over a rope over his chest, crossing the rope ends, turned the back against Y's and bowed down at a 90 degree angle so that Y's body laid on Z's. Then Z held this position in what felt like a few minutes. Y finished kicking and coughing much earlier than these minutes in to it.
Z took the motorcycle, put Y on it and leaned it against the wall and continued down the alley, not out in front of the restaurant.
For that Z would be cleared, Z went back to Y's work and asked the friends / colleagues where Y is, Z could not find Y in the restaurant.
No one knows that Z did it. It came out on the news. Sometimes Z thinks to tell X that it was Z who killed Y.