When you identify a DNA match only to find out they have died

[kiterunner]

This has happened to me twice today, perhaps because I decided to take a break from ancestry and have a look through my matches on My Heritage and FamilyTreeDNA, which I haven't done much with up to now. I managed to figure out how a couple of my DNA matches on those sites were related to me, but instead of sending them messages introducing myself and explaining my relationship to them, I have had to add them to my tree with a death date. Really puts a damper on the excitement of discovery. And so sad reading their obituaries.

I don't know whether this is more likely to happen on those sites than on ancestry or if it's just a concidence?