I know we have discussed the motive of burglary and what could the Dermonds have had that caused someone to murder them, gold, swords, etc.
I wonder if perhaps he collected firearms? Just random thought if he had sold a firearm to someone, and I'm sure he kept meticulous records of the firearms he sold, and that someone killed him with his own firearm thus the reason to remove the head. Perhaps the original plan was to dismember both bodies, but the neighbor kept spooking them.
"In the driveway was that day’s edition of USA Today. The previous day’s as well. There, in a shaded cul-de-sac that backs up to the water, was the neighbor who had discovered the death. It had been days since he’d seen or heard from the elderly couple who lived in the house. The neighbor had phoned them several times. Nothing. So he’d gone over to check. The door was unlocked. There had been some confusion after he called for help. Bodies were not all over. There was just one. - See more at:
http://www.atlantamagazine.com/grea...d-sills-chases-a-killer/#sthash.mp9KE0IZ.dpuf
Anyway, I hear dismembering a body isn't so easy. Maybe the plans changed and the phone ringing regularly they figured they better the heck out of dodge. Stopped after beheading Mr. Dermond, loaded the boat with Mrs. Dermond and Mr. D's head and left the same way they came in - except for the detour to dump Mrs. Dermond overboard. I do expect they got some pleasure out of the decapitation and the horror it would inflict upon the community. Maybe the plan was to kidnap Mrs. Dermond and she didn't survive the blow to the head.
"Sills said finding Shirley “jumps us about two checkers up on the checkerboard.” It meant that whoever killed the Dermonds either arrived by boat or used one. A reporter asked if Shirley’s body might have been found sooner had other agencies been brought in. Sills seethed but didn’t show it. He said his deputies and wildlife rangers, among others, had crisscrossed the lake for days. He said Lake Oconee was an “18,000-acre impoundment that covers the breadth of four counties.” “I suppose,” he said, “we could have called in the whole United States Navy.” Someone asked what kind of person the killer might be. “A homicidal individual,” Sills said, “that doesn’t deserve to breathe the air of this earth.” - See more at:
http://www.atlantamagazine.com/grea...d-sills-chases-a-killer/#sthash.mp9KE0IZ.dpuf