I don't _know_ if he's moved, Harold. Or deceased and the fact isn't yet in the SSDI. All I know for sure is that the phone number I found for his ZabaSearch address is now in the name of someone else. Possible son-in-law? Possible stranger? Who knows? What I know is only that Switchboard reports it a land-line at the physical address which ZabaSearch (based, I think, on a previous post by you) gave for a Terry D. Abernathy in New Mexico, and there is currently no public phone number in Switchboard's database for a Terry Abernathy in New Mexico.
So all I can say is write and ask that it be forwarded if necessary.