Your anger is a natural reaction ..... in fact, you will go through a whole range of emotions .... anger, guilt, grief, frustration, a feeling of helplessness, and many others. Problems arise when people don't work through these conflicting emotions and finally come to a sad acceptance.
Lean on the Lord for He will help you cope, though sadly there won't be answers.
Having lost a family member this way, I know about the devastation of such a loss.