Well I guess we can agree to disagree, since it is clearly dependent on the individual congregation.
As I mentioned, the MS who committed suicide (with a shotgun to the head, no less) was given a full JW funeral, with about 350 in attendance.
I know of at least 2 JW suicide attempts, in the Toronto area, people I knew, one in the 80s and one in the early 90s. Neither were DF'd. Obviously is left up to the
judgement of the local BOE.