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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...

Murphy. >> detectives finally had a major break in the investigation. silver coins, worth around the same amount as the one taken from the tyrrell home had turned up in a local coin shop. surveillance cameras called the transactional video. the man certainly looked familiar, but, if there was any doubt, he left a copy of his i.d.. mark quarter. >> yes. >> mark edward porter. this is a real license, this was the actual day. >> that's when! >> but selling a lot of coins did not prove that marc porter was guilty of murder. remember, mark also had an interest in the queen business. >> the best exp...