[Just speculating]And the murders occurred to buy themselves more time in getting away. It seemed to have worked for them, since the couple was not found until the next morning, after 12 hours or so had past. Do you know if they put a APB out in Mexico, to see if the car may-had turned up there?
But perhaps it was the car they wanted.
And i speculate, that perhaps a week or two before the crime was committed and the car stolen, do you or anyone remember seeing anyone looking at the vehicle while parked outside, such as neighbors, and did the couple happened to mention that perhaps persons had visited them to ask and see if they would be interested in selling the car?
I don't believe, for now, that this was just a random act.
I think perhaps they knew whom lived there. and knew they were older, and would not put up much of a defense.
Someone whom had visited the couple beforehand, and knew things about them perhaps.
But i sense it was the car they wanted. So they went back that Friday night, around 11pm and knocked on the door.
When the man answered, (I don't remember reading about any forced entry) they were attacked and bounded with electrical cord, or phone line cord something like that, they were made to lay down inside the room there, where the front door is i speculate. One or both may-had there hands tied around there backs, and left laying on there stomach, but just speculating on that. After getting the keys to the car, and taking some other items, they left.
THE ABOVE ALL MOO AND SPECULATION ON MY PART.
NOTHING POSTED AS BEING FACT, UNLESS OTHERWISE KNOWN TO BE.