Easier said than done, and in/to a tune similar to a last-minute RIP tag.
Though to be fair, I recalled to a point, SB had a procedure to get that digital tombstone called "Rest In Piece". But honestly, to avoid doxxing IMO, common sense would probably be a case of "provide IRL contact details/evidence to Mods/staff", state beyond a doubt this person is dead/etc, with a certificate to prove it on top. Yadda.
And as for/on doxxing, it should probably be a procedure, that's more like a will on procedures on what to do when you die/etc.
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If anything, if not 'as' transparent or etc. I'd argue that long looong term inactive SB Users could FAIK, (and by proxy, this forum to given enough time.) Be in a sense, 'dead' already. Or even dead, and you and I don't know it beyond the "inactive/hiatus forever" status, more/less.