I just finished playing Still Life with a bunch of friends. In case you still want to play it, this question probably isn't for you.
Still Life has quite a disappointing ending. None of us could tell who the murderer was at the end of the game. However, it looks like many clues are left behind and the creators actually intended to make the game longer. So, is it possible to find out who did it, or did the game just have an annoying open ending?