Horace Simeon Coker, 10 Aug 1893 to 5 Nov 1951, married Lois Vivian Daugherty. Lois died 10 July 1990.
Daughter Helen Almer Coker, born 2 Aug 1924, died 17 Sep 1990 in Lubbock, TX
The Social Security Death Index does show "last residence" in Albuquerque, Bernalillo County.
---The "last residence" on the SSDI is NOT necessarily where a person actually lived or died. The Social Security Administration calls it simply the "home of record," and possibly the address where correspondence by the SSA was sent. It is not necessarily where any benefit was paid to the person, survivor, or the lumpsum death benefit (in years past, it was paid to anyone paying burial expenses, family member, funeral home, city/county, attorney; today, a living spouse). It is sometimes the location where the notification of death was sent to the SSA, sometimes where the lump sum death benefit was sent.
Also she may have died there, but wasn't living there, or living there long enough to have an obituary published. Her daughter died in Texas, so it "appears" Lois wasn't living with her daughter.
I checked online records for the County Clerk of Bernalillo County, and found no death related records. I checked for any Country Superior Court records (Probate, etc), but couldn't find. Suggest contacting the County Clerk. Or asking at the cemetery where she is buried. If they have the funeral home officiating, they might have records as to location of death, and transfer information, and possible obit.