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In the hometown otumwa. february, 2013, can you see yourself going into the courthouse? yeah. i remember. reporter: what do you two say to one another? we got to stay strong. reporter: the caldwells never wanted to believe seth killed lisa, but heading into trial, they were all now convinced that he did. even presley, once his staunchest supporter. there s really no other explanation for what has happened. when you left the techel residence, who was there? reporter: two prominent families, the caldwells and techels, once close in-laws, were now fiercely divided, camped on opposite sides of the courtroom. seth had pleaded not guilty. i was like just look at me, like i want to see in your eyes how you re doing. but he doesn t look at you. she was like my best friend. reporter: prosecutors called to the stand their emotional trump card. todd caldwell remembered his lisa. like everyone would tell me how much lisa and i are alike, and i would just tell everybody ....
are you ready for the jury? reporter: this time in davenport, three hours from the first courthouse in otumwa. the prosecutors once again argued that seth s story defied logic. he would have to be the victim of one of the largest coincidences ever known, and that is he told his girlfriend hoe left his wife and less than 17 hours later some unknown assailant breaks in and kills the wife that he says she s going to leave. reporter: with a weapon which he hasn t brought with him. direct. with a weapon he hasn t brought with him. a mosberg 1,200 shotgun. a 12 gauge? yes. reporter: and seth they said had easy access to the murder weapon, the shotgun that his friend lucas kept in his house. is that the mosberg shotgun that you left behind at the one went residence when you moved out in may of 2012? yes. reporter: and the prosecutors argued only seth had a motive. they said seth and rachel s steamy texts and photos played like hay countdown to murder by ....