Looks to me like your guy died in Denison,TX He was in San Diego,CA in 1940 "renting a room" and divorced. Then appears to have married Wanda Pauline Condon in Texas;public records indicate them living in Denison,TX through 1993,with an alternate address of Santa Rosa,NM. Texas death index gives a death date of July 7,1995 in Grayson County; SS death index: Name: Robert F. Stephenson SSN: 554-10-0841 Last Residence: 75021Denison, Grayson, Texas, United States of America Born: 7 Apr 1915 Died: 7 Jul 1995 State (Year) SSN issued: California (Before 1951)
Wanda Pauline Condon Stephenson died Dec.17,2003 in Grayson Co. with obit printing info as: STEPHENSON, Wanda Pauline (CONDON); 80; Denison TX; ShermanHD; 2003-12-21 "Sherman Herald Democrat" perhaps? I've no "inside information" on how to obtain the obit, but perhaps the usgenweb site for Grayson County has some clues?