Mark Quarter News Today

>> 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, thats 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 ob...

There a name attached with the text? >> i cant 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...

He wouldnt 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 marks 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 couldnt get a hold of him. she couldnt 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 gl...

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. >> thats when! >> but selling a lot of coins did not prove that marc port...

He, he was there? >> the time they were killed. >> no! >> yes, maam. yes, maam. >> okay, still circumstantial. >> we have a man here -- >> and that is why mark porters 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 mikes dna inside his best friends ...

Youre fine, we could get that done. today >> you know, always. >> okay. >> any reason? >> i dont know the legalities. i dont want to do something that my attorney say i should him. >> why would you not give us a dna sample? >> hes your best friend, were trying to figure it out. >> hes your best friend, were trying to figure out everything that we can who brutally murdered your best friends and youre telling us that youre not sure youre gonna give us a dna sample? >> the refusal was in evidence o...

Door when his offices across the street, when he doesnt 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. garys brother had told police that, not long, ago mark asked ...

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 leave with the straw. there was no reason -- >> so, he knew that you guys had eyes on him. >> it is difficult to know what he knew at that time. >> then, three months after the murders, an undercover officer followed mark into an automobile oil chain shop. >> goes inside, mark scottie comfy cup that he had gotten her mcdonalds...

>> cant even describe the emotion of it that were going to be able to hopefully bring some resolution to the tyrrell family. >> to excite, are armed with search warrants, they arrested mark porter at his office. >> how do you take that? >> you got the wrong guy, this cant be. >> absolutely, not he said, okay! he turned around, put his hands behind his back. that was the only work. okay! >> jessica was at work when she got the call. >> two of my very good friends are with me. and they said, hes b...

Probably 45-minute. >> okay. >> so, the friend said he drove across town to stop by garys house. >> i went back to the house, knocked on the door, or nothing, he did not. theyre so i thought maybe something was. wrong he said he, leave hochul her go, and he said my, bad im 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 s...