The bigger issue here is: How many "news stories" do you read titled .. ATTACKER WAS CATHOLIC, BAPTIST, METHODIST ..etc. etc.?
I see nowhere in the story where proof that this person had been confirmed as a JW?
Maybe he knew some jw's?
Maybe he studied for a time with the jw's but might he have also associated with other religions?
I personally studied with the jw's for a number of years and 'other' than the issue of blood transfusions .. I am not aware of any other "medical care" that jw's don't accept?
Yes, even the jw's are subject to imperfection, mental health issues, sickness that all religious people of all faiths are subject to.
So, my question seems pertinent here .. Why the obvious 'non-issue' of this persons supposedly being one of the jw's?