When confronted with death they struggle with the pain, the grief, the shame, the unknowing, the atrocity, the unfairness, the anger... The many and various stages and processes on the journey to acceptance.
If they could just step to the side and objectively consider the event in terms of the lesson or purpose intended through the death of that soul's person for them - the remaining living soul - then it may prove beneficial in the recovery.
Is it fair to say and use the terms "living" and "dormant"? A soul that is living is encased in a physical body - "living" a life. A soul that is dormant has returned to the place in-between lives to ponder, reflect, plan and prepare their next engagement in life.
The "ones left living" are caused to "shudder to the core". They have to continue their living and carry on their physical journey. Part of the physical journey is feeling the pain and emotions of loss and not knowing. This experience of pain and loss is part of our reason for being here. In the in-between life the dormant soul cannot engage in these experiences. The soul knows that there will be a reunion. Life will move on and recycle.
To comprehend that the death experienced by your kindred soul is intended to provide a life experience and learning to help you and others along the way is liberating. It doesn't hide or remove the pain and the emotional and mental torment but it does provide an explanation as to why it happened.
To say that "nobody dies for no reason" is parallel with saying that "nobody lives for no reason". The living and the dying is intended. There is a purpose - a reason. Thus Pete Seeger's song "Turn, Turn, Turn".
There is a season - Turn, Turn Turn
And a time for every purpose
The wording of this song pretty much comes directly from the bible's Book of Ecclesiastes. Being an Old Testament book, it is most likely speaking more Kabbalisticly than Christian as it pre-dates Christianity. Note that Jesus was not a Christian. Jesus was a student and master of Jewish Kabbalah.