To me the title chosen should be the one most recognisable in a Google search While Woolwich murder and Woolwich attack are both currently common in sources I dont see how murder helps anyone not familiar with the incident to recognise it There were  murders in London last year some of which either deserve or already have Wikipedia articles I would have thought I doubt theres any that are about attacks in Woolwich in  Bearing in mind that on Wikipedia calling something an attack in a nonwarzone in these times basically means terrorism and more often than not will involve murder To illustrate that  London attack is already a redirect to List of terrorist incidents in London which obviously has a link to this article whereas London murder goes nowhere and gives all sorts of random articles in the search results none of which appear to be of any use to someone looking for this article Similarly Woolwich attack already redirects here whereas Woolwich murder goes nowhere although Id have no objection to it coming here