In the reports I've seen that mention he was a JW, it's brought up in the context of: 1) refusing certain medical care, 2) quote of the neighbor who said he was a JW who shunned Western medicine and encouraged herbal remedies (That's not exactly a WT policy, but not uncommon among the JWs I've known).
None of the local news broadcasts I've seen mention that he was a JW.
It's a tragedy. And he might have done the same thing regardless of which religion he belonged to. But I see this event as a huge smear against WT's "Da Troof Transforms Lives" type of articles. WT is like every other religion that can report "We transform some lives for the better, but we still have plenty that can fly off the rails at any moment."