Mark Quarter News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> 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...

There a name attached with the text? >> i can't remember. >> remember, gary was shot as well as beaten. could it have been with one of his own guns? >> gary has gone everywhere. gary has guns in every draw of the house i think. he likes his guns, he loves guns. >> but that mark gave detectives a detail that took him completely by surprise. >> he was supposed to meet me at 8:00 on wednesday and did not show. >> wednesday, the night of the murders. it was the first that police were hearing of carry having plans that night. what else did the best find no? >> coming up, mark gives a detailed accou...

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? >>...

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...

He, he was there? >> the time they were killed. >> no! >> yes, ma'am. yes, ma'am. >> okay, still circumstantial. >> we have a man here -- >> and that is why mark porter's defense attorney seemed ready to argue. mark hired one of the best to plead his case. >> he has a spotless record. five college degrees and has an outstanding past of good reputation. >> at a bond hearing, the defense revealed its strategy. they would argue that there was nothing suspicious about mike's dna inside his best friends house. >> he was a regular visitor to the house, quarter. he would get we gary, they would put o...