HOW WILL HE FEEL WHEN HE GROWS UP.?

How will this two year old child feel when he becomes a man, and be told that he accidentally killed his own mother at the age of two ,with her mothers own gun? This actually happened in America recently when a two year old child unbelted at the back of a car ,took a gun from the back seat , pulled the trigger and accidentally killed his own mother. Will this guilt be wiped away from this boys life ,though innocent?