The Times reports that a young German man, David Heiss, became infatuated with Joanna Witton while playing on a cyber war website set up by Joanna and her boyfriend, Matthew Pyke, in the UK.
After seeing her photo on Facebook, Mr Heiss made up his mind that she was the girl for him, sending her a stream of disturbing messages despite her protests that she was already in a relationship.
Travelling to the UK from Germany, Mr Heiss tracked the couple down, committing the murder on his second visit. The killing of the victim was said by the prosecution to be driven by "...obsession for Joanna Witton, who was Matthew's girlfriend, and hatred for Matthew, because he was Joanna's boyfriend".
(Source: The Times)