> At a later date, Walter returned to Durango, Mexico and died there about 1952.
> Now for the speculation! Why did Walter leave his family in Texas to live out
> the rest of his life in Mexico?

I found the book "Border Healing Woman: The Story of Jewel Babb as told to Pat LittleDog" at a local library. She describes Walter's death as follows (p. 59):

"About the time I moved out there [to the Indian Hot Springs near Sierra Blanca, Texas], Walter went to Mexico to trap some lions, way back over there close to Torreón. He loved to trap, and there was some big panther over there. He had heart trouble, see, and he wanted to get away from all this. He never did like people. Never did like to be around them. So he thought, if he got over there, he might get better. He had angina. So he went over there, and he died there. I heard it by telegram. He knew he was sick, and I did, too. He was buried in Mexico.

"He had been a good man. A good worker. And he always could make money where nobody else could. He was sure a good worker. He never got hurt til he was about forty years old, and then a horse stepped in a hole and the saddle horn hit him right here [Mrs. Babb indicated a spot several inches above the stomach area]. Taken a long time for him to get all right. Then he got all right, but it started hurting again when he was about sixy years old. Caused obstruction and heart trouble. If I knew then what I know now, it wouldn't have been nothing. So when he'd get nervous, it'd tighten up all these vessels leading into the heart, and he'd have a heart attack. But it was about fifteen years after the injury that it started bothering him."

From this we can determine that he was about 55-60 years old when his heart started bothering him the second time, and since he was 32 in 1930 (per census) he must have died in 1953 or later -- but it could have been 10 years later for all we know.

Torreón is in the state of Coahuila, but that's adjacent to the state of Durango, so maybe that's where he ended up.

In any case, this seems to remove any speculation about why he went back to Mexico, not intentionally to "live out the rest of his life" but because he went down there for some rest and recreation but died suddenly, seemingly not long after he arrived. That doesn't preclude the possibility that he produced another child while there, of course :-).