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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...

One. >> you started tailing mark porter? >> yes. >> car outside the house? >> we had undercover officers who were constantly doing surveillance for weeks, weeks and weeks to somehow obtain a dna sample from him. >> but, nabbing a sample proved more difficult than expected. in all of those weeks, officers continued to come up empty. >> they watched him eat lunch, they watched him get a to go cup, and they were all excited because they thought they were gonna be able to get the straw that he had been drinking his drink with, only to see him pick the straw up and put it into his to go cup and lea...

He wouldn't take a polygraph. so >> after that, the suspicious pawn shop transactions. and, the story about stopping by the terrell house on the night of the murder. >> and, a top with mark's wife about the night of the killings, only made them more certain. >> she had talked about making a couple of phone calls to mark and, she couldn't get a hold of him. she couldn't get a hold of where he was, what he was doing. >> but, police still needed physical evidence, a dna sample to match to that latex glove found at the scene. so, they hatched a plan together. >> you started tailing mark porter? >>...