Welcome TQ,
I believe what your going thru is surviver guilt.
You could do nothing to stop this tragedy,
there is a large plan written out by our HP
We simply don't know what it is. Often times the last conversation
we have with a loved one, suffering from alcoholism is not a pleasant one
please try to forgive your self, you had no idea this would happen.
God Bless, And keep ComingBack.