Othel seems to show up on records with differences in his name.TX Birth Idx:
George Leon McCorstin, b 22 Apr 1928 Runnels Co, TX; mother Mary Allene Neely; father "George Leon McCorstin".
TX Dth Idx Online 1964-1998:
"George Othel McCorstin", d 30 Jun 1979 Runnels Co, TX.
"G. McCorstin", b 16 Sep 1904; d 30 Jun 1979; last residence & benefit Ballinger, Runnels Co, TX; SS card issued in TX.
TX Dth Idx Online:
Mary E. McCorstin, d 28 Jul 1977 Tom Green Co, TX.
Mary McCorstin, b 29 Mar 1910; d Jul 1977; last residence Ballinger, Runnels Co, TX; SS card issued in TX.
SSDI for son:
George Leon McCorstin, b 22 Apr 1928; d 18 Aug 2001; last residence Cedar Hill, Dallas Co, TX; SS card issued in TX.
Using an online directory such as http://www.four11.comhttp://www.four11.com -- there are 6 named McCorstin listed.Three are in Garland, which is Dallas Co, TX; and one is nearby Fort Worth.I would try them.
An obit for George (Jr.) might give you list of survivors, and if they lived out of the immediate area, town or state of their residence might be included.His death being so recent, info might be up to date in the obit.