Mike, I did a bit of home work today and hopefully what I found will fill in some blanks. Actually I also wondered about Mary's plight as well after July 31st. 1964,

The article I finally found is quite clear in it's description. And I quote. (additional info on Mary after 1964 is of course in Larry's well researched book as well)

Mary Reeves continued to live in their home on Westchester Drive in Madison, Tennessee, for a significant period following Jim's death in July 1964.. She remained in the home, maintaining his legacy, until approximately 1980, when she and her new husband Terry Davis, purchased a different property called Evergreen Place. Mary and Terry were married in 1969.

Residence Management... She lived in the house built by Jim in 1958 for roughly 16 years after Jim's 1964 death. End quote.

The article goes on further to chronical Mary's mental health that started to deteriorate a few years after the move to Evergreen Place. Disturbing stories of both of them hording cats from the neighbourhood became public. A Very sad story, as Bob alluded to.

If anyone can correct or add to what I found please do so. Very important to get the facts correct especially for us rabid fans !!