The language my top comment used was "homocide" and "negligent homocide" while the responder changed it to "murder". The point is that in the view of the justice system, sometimes it doesn't matter if you meant to kill someone or not--you still killed someone.
Even with negligent homicide the perpetrator's mindset is still taken into account. It is only negligent homicide if they should reasonably have known that their actions could cause the death.