in april of 2007, seven months after kathy's death, detective breitigan got a search warrant for theing as officers seized a computer, papers and mark's journals. detective breitigan says the journals really caught his attention. >> you would have to read the whole thing, and i cannot explain, i wish i could, it's just he was at the end of his rope. he felt trap. >> reporter: but now, all these months later mark wangler's life was on the upswing, he had reconnected with an old friend who shared his faith, esther vandyne. a romance blossomed. you ended up getting married, i think about a year after kathy's death. >> 14 months, correct. >> reporter: some people might think that is pretty fast to bounce back. >> we've heard that. >> reporter: and the wedding bells had barely stopped ringing when detective breitigan got a second search warrant. because, by now, he had come to believe that mark wangler was a killer. right again thought that wangler had used an engine of some sort, a portable generator or maybe the vehicles to put carbon monoxide into the heating system of his home, to kil