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Andy was the last to see his parents alive, the one who found their bodies in the morning, which made him, bizarre though it sounds, a potential suspect. >> before i even saw steve and tami, they had put me in a car and took me to another town and questioned me in a room. >> reporter: trying to establish whether or not you were involved. >> yeah. did gunshot residue tests. like is this really happening? >> reporter: andy stock didn't realize it at the time but investigators were soon looking hard at him. after all, he was there, he had opportunity and he may have had motive. he might have had ...

>> trying to establish whether or not you were involved. >> yeah. did gunshot residue tests. is this really happening? >> andy stock didn't realize it at the time, investigators were looking hard right at him. after all, he was there, he had opportunity and he may have had motive. he might have had something to gain from his parents' death. why? andy stock was the already designated heir to the stock hey company, which some people might consider a family fortune. as investigators questioned andy, csi units were busily working the crime scene as well. >> it was a very brutal crime scene, one of...

Realize it at the time but investigators were soon looking hard at him. after all, he was there, he had opportunity and he may have had motive. he might have had something to gain from his parents' death. why? andy stock was the already designated heir to the stock hay company, which some people might consider a family fortune. investigators questioned andy, csi units were busily working the crime scene as well. >> it was a very brutal crime scene. it was one of the worst i've ever seen. >> reporter: one of those leading the investigation? david kofoed, the head of the csi squad in douglas cou...

Andy, csi units were busily working the crime scene as well. >> it was a very brutal crime scene. it was one of the worst i've ever seen. >> reporter: one of those leading the investigation? david kofoed, the head of the csi squad in douglas county. from omaha, an hour away, he was called in to help the smaller cass county sheriff's department. >> what really bothers me is that these two people were just sleeping in bed and the male victim was apparently crawling away and he was shot in the head. clearly an execution. >> reporter: close up. >> close up. and the female victim was along the side...

Realize it at the time but investigators were soon looking hard right at him. after all, he was there, he had opportunity, and he may have had motive. he might have had something to gain from his parents' death. why? andy stock was the already designated heir to the stock hay company, which some people might consider a family fortune. as investigators questioned andy, csi units were busily working the crime scene as well. >> it was a very brutal crime scene. it was one of the worst i've ever seen. >> reporter: one of those leading the investigation? david kofoed, the head of the csi squad in d...