This is, truly and honestly, an unfortunate and dismaying thing to have learned, especially so far after the fact.
Deman was truly a one-of-a-kind person in this community. It was refreshing to have known someone, albeit indirectly, who was as level-headed. I definitely found him to be wise, in an understated way; the sort of way that is immediately approachable, but no less profound. As a fellow forum staffer, I regret that our discussions mostly ended up being centred around forum politics (a domain that I am pleased to know requires little input, anymore), but, all the same, left me with an incredible impression of the man.
A tragic reminder of our own fragility, but I hope that Deman rests in peace, and that his family, friends, loved ones, and supporters are able to soldier forth holding onto the eternal boon that is their relationship with him.
Farewell, Deman. Though I only knew you as a brother-in-arms (for lack of an alternative phrase), I will miss you and will count myself among the number of fortunate individuals who've had the chance to benefit from your friendship.