As a matter of policy, police should now be examining every computer to which this man had access.
Do they have a 'congregation' PC in Kingdom Halls?
Do the WTBTS Bethel complexes have a computer network, and would he have had access to it? If so, the whole network (or at least the part he had access to) should be examined.
May prove interesting. I wonder whether the FBI may become involved? (My guess would be 'yes').