grief comes in many forms, anger, rage, disbelief that the loved one has gone, upset that you can no longer hold them, have a conversation, nor get them back, sadness for losing someone you cared about, and sometimes its relief when they die, if they have suffered. If the person were killed by another, a violent death, then i would think that you would feel rage and would want that person hurt, or certainly locked away, but the disbelief, grief would still be there. I am not sure either example are all that different, its quite a difficult subject, because its rarely spoken of.
As to what happens after death, no one knows, many people believe that theres a lot more to come afer we die, or we come back as another being, but quite frankly i don't believe that, once we are gone that's it.
But others may have a completely different take on all of this.