Update: In view of the comments, I acknowledge that this post was not very well-considered. I'm leaving it up because my policy/approach is to delete things only rarely (though I have done it on occasion). In blogging I find there's a line one walks between off-the-cuff reactions and considered reflections; generally I prefer the latter but I have sometimes posted the former as well. In general -- though, again, I have occasionally broken this rule -- I try not to venture with confident-seeming pronouncements into terrain where I don't have enough facts or knowledge to warrant that.
The answer to the question posed by this post's title is, I venture to suggest: maybe, but not necessarily and not always.
The occasion for the question is the NewsHour report I just heard on the Oscar Pistorius case, in which the South African journalist being interviewed said that some groups in the country are using the case to highlight the problem of violence against women. Granting that violence against women is a problem in many places, South Africa no doubt included, one might nonetheless ask whether a man shooting a woman, who was his girlfriend but who he claims he thought was an intruder, is a good vehicle for making a point about violence against women.
This is not, it seems to me, much like, for instance, the horrible, brutal recent gang rape in India of a young woman who then died of her injuries. That was a crime of violence and a clear instance of violence against women. In the Pistorius case, all that appears to be known is that a famous athlete shot his girlfriend and claims it was an accident, while the prosecution is pursuing a charge of premeditated murder. Was it the result of an argument? A crime of passion, to use an old-fashioned phrase? A mistake? It's not clear, judging from the report I just heard. In these circumstances, to jump to the conclusion that this is an instance of the category 'violence against women' seems somewhat unwarranted. Unless, of course, you think that every crime in which the victim is a woman constitutes an instance of 'violence against women,' in which case 'violence against women' stops designating an identifiable type of gender subordination and becomes simply a descriptive (and perhaps not very helpful) phrase.