After taking out a $110,000 life insurance policy on Clayton, thereby clearing the road of any undue suspicion, the first step was to procure a body that they could pretend was Clayton's. So, the couple visited a graveyard in the dark of night and dug up the corpse of a Ms. Charlotte Davis, an elderly woman who had been dead for over a year.
"She was my 10th grade math teacher, and fuck her, that's why."
They then dressed the corpse in Clayton's clothing (which included, not surprisingly, a baseball cap with a fishhook attached), put the body behind the wheel of a Chevy and pushed the car over a cliff. When the impact failed to produce a spectacular explosion like they'd seen in action movies, they climbed down with some lighter fluid and set Ms. Davis on fire (by our count, at this point Ms. Davis had been killed at least three times).
Now it was time for the real Clayton to disappear. But instead of laying low for a few years in some backwater Alabama town, Clayton simply dyed his hair and grew a mustache, then returned home and started introducing himself to his neighbors and 4-year-old son as Molly's new boyfriend, "Jake."