IMO if this is the claim and is what occurred(not exact but something similar in nature with it being initially accidental and not intentional) then IMO I can find ZERO REASON, EXCUSE, OR CAUSE FOR EITHER OF THESE MEN TO NOT IMMEDIATELY AID IN RECOVERING HER BODY!!!..
SBM
I don't agree. I can think of several cases where the perpetrator was highly motivated to help LE locate remains but was unable to do so effectively.
Have you ever gone driving aimlessly in a plains area? The entire state of Iowa is a virtual metropolis compared to western North Dakota and northern Montana but it is still possible to get completely lost or to be unable to re-trace one's route here. Rolling hills, trees, more rolling hills, more trees, occasional white farmhouses (there are very few farmhouses not painted white here), more rolling hills, more trees.
To people not in love with the plains, it is boring terrain. To those few of us who love it, it is the most beautiful land on earth.
People think they would remember their route or they think they remembered significant landmarks but when it comes time to actually prove it, it turns out their memory was not as good as they thought, they weren't quite sure where they were (particularly if they got onto two lane or gravel roads) and/or the landmarks they describe turn out to apply to hundreds or thousands of possible sites.
The fact that the time of the crime was approximately an hour before there was significant light means that vision would be restricted mostly to what you can see on the road and a couple feet to either side.
If you are used to living in the plains states, you keep a rough map of the major highways across the states. You know at all times roughly what zone between major highways you're in but you may well not know to any degree of accuracy just where you are.
If you know the plains, it's not a problem. You know that if you keep going in roughly the correct direction, you will sooner or later cross the major highway you're aimed at. But that intersection could be literally a couple hundred miles away.
And if you know the plains in the winter, you never let your gas tank go below half (or better, three quarters) because during one of the extreme drops in temperature, a gas tank that is mostly full is less likely to develop vapour lock while parked. So you're likely to have plenty of gas to keep going and going, if that's what you end up doing.