lynn's husband of 25 years. i love them so much. >> reporter: and so in a sad, on the surface, it didn't make strange way, out of unimaginable much sense. evil and loss came love. after all, fred had been cooperative with detectives from day one. a real family. and yes, he had moved out of the family house, but he told them an unexpected blessing. the break was amicable. what's he done for you she was my best friend, he said. personally, having him in your life? and yet, not long after the murder, yuck charlie south out detective birdsall and whispered an awful question. >> it's like getting another life. >> did my dad have something to do with this? >> reporter: charlie remembers what they told him. like somebody opened a door and >> the detective was very quick said, here's a second chance. to assure me that they have no suspicions of that. >> reporter: got a reason to get up in the morning these days. they don't think that would be something that was happening. >> damn straight. and if they had thought that, that they would already have a reason to live. looked into it and not to worry >> reporter: mark and susan are about that. now his mom and dad. >> reporter: is that what he has taken their last name. detectives really believed? and charlie has more than well, no. survived. >> we had to sit there and look at him in the eye and say, we'll he is thriving. catch everybody who was >> i'm going somewhere, and i'm involved. going fast. >> reporter: but not say, we >> reporter: he's a grad student suspect him? >> exactly. >> reporter: they believed they simply couldn't tell charlie or the rest of the family what they with ambitions in theme park