One that I know of. She was a colleague of my ex and she was still a wanted woman in Germany. She'd been on holiday with a friend and they were invited onto some rich bloke's yacht. Anyway, he turned out to be a psychopath/ rapist and they had to fight to save themselves. They ended up killing him. There's even a movie about the event though I can't remember the name of it, but I did see it once.
Now this has got me thinking - my Dad met a few murderers during the time he was re-wiring Dartmoor Prison and fitting new lights. He accidentally let known the date the new lights were being connected up and there was a big escape during the time the electricity was off. That's what he told me anyway - the bloke who got away was an IRA murderer.
But I remember him telling me some of their stories - the one that sticks in my memory is the guy who chopped his wife up and kept her in a suitcase.
I also knew a gang of trouble makers when i was at school - more in the role of victim than friend. They attacked me one day and it was reported to the police. Anyway a year or so later one of them was in court and me and my friend being beaten up came up as an extra crime he wanted to be taken into consideration. I got compensation for it, half of which i had to give to my sister for some reason.
The main crime he was up for was an extremely serious assault on a nurse where she had quite nasty head injuries where he'd struck her with a blunt object. I reckon this guy was a murderer in the making. I hope they got him locked up before he did kill though.