for memorabilia. >> and he was big into buying and selling gold and silver. >> reporter: gary's brother, larry tyrrell. >> he constantly collected coins and bought gold and silver trinkets. >> he did very well at it. gary was a good businessman. >> reporter: the gold and silver went into one of five safes in the house. but the coins and artifacts, many of them museum quality, were out on display. >> he had a lot of rare pieces. a lot of indian jewelry that was very quality pieces that he loved. >> reporter: what was his most unusual piece, do you think? >> probably be the walrus tusks that he owned. scrimshaw. and each worth around $10,000. so how would he find these things? >> i'm not really sure. they did go to flea markets and garage sales and things like that, but any time i would ask him, you know, where did you get this? he would say, oh, in my travels. >> reporter: in 2013, jason murray became one of the family when he and jessica got engaged. he remembers the walrus tusks as well as all the other unusual items in the tyrrell home. >> it was one of those tng stuff in the house and yet it was im

superintendent and by all a of the community, was now a prime suspect in the murders of jan and gary tyrrell. >> i never did like the guy. i never did trust him. i thought he was something of a fake. >> reporter: gary's brother larry always had a bad feeling about mark. and he was convinced if mark was the killer, the motive was money. >> i felt that he was befriending and recruiting and grooming my brother to gain access to his money. >> reporter: when jessica heard detectives were looking at mark, she wasn't surprised. >> he didn't show up at the funeral. >> reporter: conspicuous in his absence? or am i making too much of his nonappearance? >> i think it was pretty obvious that there was something going on. >> reporter: and his former secretary said she hated working for mark porter. ended up quitting her job to get away from him. >> i said he's off in some way. i don't know. >> reporter: you used that word? >> i did. >> reporter: but what bothered police was his lack of cooperation. >> he wouldn't give dna. he wouldn't take a polygraph. >> reporter: add to that the suspicious pawn shop tr