I'm just a poor country hick and I don't know what is customary but I would be very hesitant to title something "xxxxxxxxxx dead" without noting some supporting information. I took John's Concealed Carry Class several years ago which I would certainly recommend. Perhaps a better title might be "Has anybody heard from XXXXXX lately" or perhaps a pm to the person.
Additional information- There is an online obit of a John Ross, 72, poet and liberal activist passing way out west which I would strongly hope is not "our John Ross". I also don't think our John Ross is 72 and I don't think he is a renowned poet. Maybe this is the John Ross the OP is talking about since he doesn't tell us anything about which John Ross. There are probably a lot of folks with the name John Ross. I sincerely hope "our John Ross" hangs around for another 30 or 40 years.