seth techel. brian tate (recording): seth techel? todd caldwell (recording): yup. te (recording): torkel? todd caldwell (recording): techel. brian tate (recording): techel. todd caldwell (recording): yeah, his dad owns champion bowl. brian tate (recording): okay. todd caldwell (recording): and ill tell-- i just-- theyre good people. they really are. dennis murphy: now this guy, brian tate, does he know that youre the father-in-law of the neighbor? todd caldwell: no, and i dont want to tell him that because i dont want that to affect maybe what he does or doesnt do. dennis murphy: and he thinks thats the source of his trouble? todd caldwell: right. dennis murphy: those people over in the trailer property across the way? todd caldwell: yeah. (recording): well, if you can, let us deal with it. you know? brian tate (recording): yeah. what if-- what if-- what if im the one whos got to catch him? dennis murphy (voiceover): brian tate told todd that dog feces and rocks had been hurled at his home. he then showed todd the evidence. he described the vandalism of his home in

it's great for them. >> the long-awaited murder trial seth techel was in baltimore. 2013, did you see yourself going in the courthouse? >> i remember. >> would you say? >> we've got to stay strong. >> caldwells never wanted to believe seth killed lisa but heading into trial, they were convinced he did. even presley, once his staunchest supporter. >> there's really no other explanation for what happened. >> when you left the techel resident, who was there? >> two prominent families, once close in-laws were fiercely divided. camped on opposite sides of the courtroom. seth pleaded not guilty. >> i was like, look at me. i want to see how you're doing. but, he doesn't look at you. >> she was my best friend. >> prosecutors called to the stand there and emotional trump card. todd caldwell remembered his lisa. >> how much lisa and i are alike and i would tell everybody that she is the best parts of me. >> the prosecution had the burden of proving the charges. first-degree murder and nonconsensual termination of a pregnancy. what did you think your strongest fact was? the str