This is so sad. We always have so much hope, it's devastating to lose a person we love and care so much about.
My prayers are with this young man's family and also your son.
I recently saw a sign in front of a church that read:
<center>With Faith all things
are possible, not easy.
Death is a very difficult thing to explain or understand, especially when we see so much pain and suffering. It becomes more difficult to understand or explain. May the Lord guide you through and give you the words to explain this death to your son.