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between the memorabilia and the murder? >> the question is who is going to benefit by these two deaths. >> jessica was the only child and she is the sole heir. >> sole heir. >> was there somebody else who stood to gain? >> investigators would discover a clue. >> by far the most important piece of evidence that was in the case. that would reveal a mind-blowing betrayal. >> somebody with a sick mind, that's all i know. >> welcome to dateline. it was a hobby that turned into a passion, collecting. and they were good at it. amassing a fortune that they kept right there in their home. it ...

my parents were gone. >> a beloved couple founde of te along with a lifetime of valuable curiosities that they had collected. >> she was big into civil war, guns, coins, all kinds. >> was there any connection between the memorabilia and the murder? >> the question is who is going to benefit by these two deaths. >> jessica was the only child and she is the sole heir. >> sole heir. >> was there somebody else who stood to gain? >> investigators would discover a clue. >> by far the most important piece of evidence that was in the case. that would reveal a mind-blowing betrayal. >> somebo...

>> seoul air. >> was there somebody else who stood to gain? >> investigators would discover a clue. >> by far the most important piece of evidence that was in the case. that would reveal a mind-blowing betrayal. >> somebody with a sick mind, that's all i know. >> welcome to dateline. it was a hobby that turned into a passion, collecting. and they were good at. amassing a fortune that they kept right there in their home and it is also where their bodies were found and the question was obvious who stood to gain? with the answer to who killed him be that simple? here is dennis murphy wi...

Leave -- go, and he said my, bad i'm in kansas city. so i have no clue. >> mark told detectives that gary had stood him up before, no big deal. so, he went back to his office at ibm to do some work. >> now, there were several things about that story that raised some questions. >> like? >> like, why would you wait 45 minutes for someone and not pick up your phone and give them a call and say, hey. what's up. >> and you forget. >> but, what seemed really strange was that marc porter had just admitted to going to the house the night of the murder, with a story that just didn't ring true. why driv...

Door when his offices across the street, when he doesn't appear that gary is showing up. >> so, he puts himself out of the house? >> he puts himself out of the house, yes. >> inside the interview room, the detective decided, it was time for very. >> just give me a couple of seconds a circle by fair. is there anything, else gonna get you anything? koch? what? or anything? >> trying to make sense of it. including this bit of information. gary's brother had told police that, not long, ago mark asked gary for a long. per the request in writing. and not just a little bit till payday. but an eye-pop...