My bet would be in descending order:
1: Wandered into a Mexican Mafia (wetback) growing area and were killed for their trouble.
2: Drove off the road in one of our steep canyons up here and wound up in the bottom of one of our rivers.
3: Bigfoot ate’em.
And the jarhead wins on entry number 2! Turns out they did go off the road in a steep canyon and wind up in a river!