Who killed the President of Rwanda?

To this day that is still in dispute. The Hutu dominated government and media immediately claimed that the Tutsi rebel group the Rwanda Patriotic Front was responsible for the 1994 killing but there are many suspicious aspects of the assassination. For example, the black box from the plane mysteriously disappeared. It is also difficult to understand how the RPF would benefit from the assassination since the President was on the verge of creating peace in Rwanda. From what I understand no one has ever been charged and no concrete proof has ever been brought forth connecting the event to the RPF or any other group for that matter. the tutsi rebels