What Happened to Dwayne?

Witnesses said they saw Hattie and Dwayne at a burger joint called Pete's drive in around 9 PM that night. That is the last time they were seen alive by anyone except of course the killer. The next day after they find Dwayne's body a county road worker found Patty's body eight miles away from where Dwayne was found. She had been shot in the head just like Dwayne. She had also been sexually assaulted and she had been dumped off a steep 20 foot in bank mint.