Go get him now reporter a neighbor with a gun and a grudge. I thought, they better get to him before i do. Reporter but some said this couple was having trouble. That seth had a secret. Did he tell you, she sent me some topless pictures . Yes. Reporter others said the real murderer was someone else, right under cops noses. Heres a legitimate suspect that should have been investigated. Reporter a case unfolding on camera, one that would test three juries, shatter two families. Just like somebody hit me in the stomach. Reporter and take one final twist that was her biggest secret. Im lester holt and this is dateline. Heres Dennis Murphy with before dawn. Reporter the cornfields of iowa are a far piece from memphis. But it was here, in ottumwa, iowa, a baby girl was named after a princess. Lisa marie. Yep, that one. As a kid, i was pretty big into elvis. I knew that my first daughter was gonna be lisa marie because of elvis, of course. Reporter just as Todd Caldwell hoped, his little lisa lived up to her big name. She was just the life of the party. Once she started talking, she hadnt shut up. Reporter theyre divorced now but tracy and Todd Caldwell watched their girl grow up all but unstoppable. A vivacious, winning teen. Bowling, todd, were not just talking recreational saturday night now and then . No, were talkin about a state champion bowler. Anything she did, she had to be the best at it. Reporter lisa was a teenager when her parents divorced. Todd remained an active father to lisa and his three other children, all the while he was working a stressful and dangerous job as a deputy in the Wapello CountySheriffs Department. He found comfort in several ways. One was his occasional hobby. Hed take out his sketch pad from time to time. And then he met and fell hard for a nurse named amy. Before long, he was starting fatherhood all over again. With twin daughters. This time, he was getting lots of help from lisa. She was the twins default babysitter. She was more like a second mom to the twins than a big sister. She was just a caregiver to anybody. They had a very close relationship . Uhhuh. Very. I would get into bed with her. Wed watch old episodes of the golden girls. Thats a sweet relationship. Yeah. And she always says that i was dorothy, because im such a grouch all the time. But yeah, that was my favorite time with lisa. Im so lucky. Reporter but stepmom amy put on her enforcer hat when it came to lisas teenage romantic life. I wanted to know who the boyfriends were. I wanted to know who their parents were. I was the one that they had to pass the test with. Reporter the boyfriend who passed with flying colors was a kid named seth techel. He came from a longtime local family. His grandfather had been the umpteen terms mayor of ottumwa. Mom was a social worker. Dad owned a local Bowling Alley. And the Bowling Alley was where seth, as a young teen, began noticing lisa. His dad was her highschool coach and seth bowled almost but not quite as well as lisa. The two worked parttime together at the lanes. They were becoming boyfriendgirlfriend and that was fine with both their families. So you liked this young girl . Oh, a lot. Yeah. She was a part of our family. Yeah. Reporter the techels were a churchgoing family and seths mom lorraine remembers how the boys compassion for others shone on a Relief Mission to mississippi after hurricane katrina. He just stood and talked to these folks for hours and hours. And they just became very good friends. And i have a lot of memories like that of seth. Helping people . Yup. Reporter and lisa wanted to help people, too. She followed her father into Law Enforcement. First as a reserve deputy in todds Sheriffs Department and then as a jailer in a neighboring county. I told her that she would have my blessings if she wasnt just an average cop. I wanted her to be a really great cop, because i didnt wanna have to worry about, you know, her inefficiencies maybe endangering her life. Reporter after years of hearing patrons at the Bowling Alley joke about when the two of them were going to get married, seth and lisa made the inevitable official. How do you find out theyre gonna get hitched . Seth actually came to our house and met with us and asked us our permission to marry lisa. Old school . Old school. Reporter after dating for sevenyears, seth and lisa got married in october, 2011. She was 22; he was 21. I just told him that no matter what he did, to take care of her and protect her. And he said . He said he would. Reporter lisas sister another elvis namesake presley got much more than a brotherinlaw with seth. He was my best friend. He was just kind of that other person that i could always go to. He called me, dad. We told each other we loved each other. We hugged every time we left each other. I mean i felt as close to him as i did my son. Reporter for lisa it wasnt just gaining a husband, it was having all his buddies come along, too. A package deal. So how did lisa put up with you guys . She was kind of interested in the same things that all of us were. Like, she liked to go fishing. She liked to go hunting. She liked to shoot guns. Was she okay . Better than seth. It sounds like you guys all would have been happy if she were your girlfriend. Seth was lucky. Reporter lucky, for sure. But seth knew it was time to settle down and get a real job. Like lisa he was drawn to uniformed service. Hed signed on as a volunteer firefighter and drew a paycheck as a security guard. But his fatherinlaw todd was helping him get a higher rung on the ladder with a soontostart job as a jailer for the sheriffs. Reporter they were very close. Todd was a big influence on seth. Thats why i think he went into Law Enforcement. Reporter a new job, a young marriage and now more changes for seth. He was going to be a father. Theyd picked a name for the unborn girl zoey maria. In may 2012 they were halfway through the pregnancy. Seth and lisa, a baby on the way, were starting out their married life in this humble little trailer. It was a gift from his dad, perched on just a beautiful piece of property. It was a kind of starter home while they saved some money for the future. The only apparent cloud in the picture was an escalating feud with an across the fence neighbor here. There was bad blood. It happened at 5 00 in the morning. A sudden, horrifying sound that shattered two young lives. Wapello county 911. Whats your emergency . Reporter saturday, may 26, 2012. Memorial day weekend. Shes not breathing. Does she have any medical problems . No, shes been shot. Reporter a shotgun blast had ended all the plans of mr. And mrs. Seth techel. Newlywed, momtobe, and now out of the blue victim of a violent attack. Who would want to hurt lisa . 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Today her doctor has her on a bayer aspirin regimen to help reduce the risk of another one. If youve had a heart attack be sure to talk to your doctor before you begin an aspirin regimen. So did you hear the new iphone is out . Im getting one sprint is offering this exclusive new plan with unlimited data. The plan is only 50 a month 50 . Unlimited iphone [glass shattering] so should we eat . The new sprint simply unlimited plan, exclusively for iphone 6. Unlimited data, talk and text for just 50 a month. Switch to sprint and well buy out your contract. Its the best value in wireless. Reporter it was the end of a long overnight shift for sheriffs Deputy Marty Wonderlin the only deputy on duty in Wapello County, iowa. All was quiet and with the first hint of daybreak that saturday morning, marty relaxed and turned up the music in his cruiser. The ragged end of the shift for you, huh . Yeah. Im takin my last little loop around the county and gonna watch the sun come up and go home and go to bed. Reporter that plan came to an abrupt end around 5 30 am, when seth techel made a desperate 911 call from his house. Shes been shot. Im going to [ bleep ] kill who i was getting ready for work and i heard a gunshot and i came running out and she was shot in the side. Reporter dispatch relayed the message to marty wonderlin. The young deputy had never gotten a call like this. I have a report of a lady not breathing. I have now been advised this ladys just been shot. Is your heart pounding a little . Oh, yeah. Thats an understatement. Reporter with his car and his mind both doing ninety, marty raced to the house in under 10 minutes. He slowed along the rise of the gravel country road and stopped in the driveway. He had no idea what hed be facing. His dashboard camera captured the scene as he approached the house. Heres how you get in the trailer. What do you see, right about here . You could see seth techel up on the porch. He was wearing cargo shorts and a belt, and he just bent over, you know . Whats he doing . Sounds like hes crying. Just sobbing. Reporter the toughest call of martys career was suddenly so much more complicated. He knew the grieving husband on the porch considered him a friend, knew his wife lisa too, and her father todd was a respected fellow deputy. The unfolding tragedy had just become very personal. Deputy, how do you set your brain in compartments, where you gotta be very professional . This is the first time youve had a major crime, and yet its also people you know . Its tough. Were you scared . Its okay if you were. Yeah, definitely was scared. You know, concerned about a lot of different things. You didnt know if somebody coulda winged a shot at you . Yeah, i mean, that was possible the whole time. Reporter as the only cop at a dangerous, chaotic scene the possibility of a live shooter still on the grounds martys adrenaline was pumping. When he entered the trailer, a paramedic was attending to lisa. She was lying in her bed. It didnt look good. Martys only thought was to help her but he had to secure his rifle, so he ran back to his cruiser to lock it up. I got on my radio and i think i told dispatch, get 58 out here. Call 58 and have him get out here. Reporter badge 58 meant deputy Todd Caldwell, lisas father. In hindsight, i wish i wouldnta done that. I wish i would why do you say that . Well, cause i saw a lotta things that morning and now because of me, because of askin him to, you know, come out there, hes gonna have to live with some of those same images that i do now. Reporter Todd Caldwell was asleep but his cell phone was plugged in next to the bed always ready for a middleofthenight emergency call. We get a call from, you know, a dispatcher ive known for 20 years and i can tell that his voice is different. And from what i remember, he just said, you know, you need to get out to lisas house. Shes been shot and isnt breathing. Reporter todds wife amy bolted out of bed. Her stepdaughter her best friend needed her. I kinda left him behind. I didnt put shoes on, didnt have socks on. I went in my pajamas and drove 90 mile an hour, you know . Im an e. R. Nurse. Im thinkin youre sort of in nurse mode there too . Yeah. I was i im thinkin, well, you know, maybe if i get there fast enough, that minutes matter . Therell be something i can do. Reporter todd raced behind in a separate vehicle. I just repeated over and over, you know, oh, my god, oh, my god, oh, my god. I just remember thats all i could think and say is, oh, my god, oh, my god, oh, my god. Reporter at the scene, deputy wonderlin ran back to the house and did what he could to help the emt. Started giving lisa cpr, so the paramedic could i think he was gettin, like, a defibullator ready. It felt like forever. You know, and im askin him, you know, you want me to do cpr still . He told me not to. Reporter there was nothing more to do. She was gone along with her unborn daughter. Lisa marie techel was just 23 yearsold. I ran in there and you could tell that she was gone. So you went into the bedroom . You saw her . Did you tend to her . Yeah. I hold her i held her hand and i rubbed her belly and and i just said, my lisa, my lisa. Todd, did you go into the house . I hope not. Yeah, i did. I went in there and i seen her layin there. And i seen the amount of blood that was on the bed and i knew, from my experience, that that was too much blood to sustain life. When i listen to like the tape recording of it, i hear myself bellowing. I dont know how to describe but i dont even remember doin that. What happened . Reporter it was a heartbreaking scene, but Deputy Marty Wonderlin had a job to do. End of your shift, your first homicide. So youre in the barrel here. Gotta start workin it. Reporter there was an immediate lead from, of all people, Todd Caldwell. The veteran cop, who had just seen his precious daughter lying dead in a pool of blood, said he knew who the shooter was. And in a voice filled with rage, he told his fellow deputies to take the suspect down. That [ bleep ] go get him. Go get him. Now. Reporter coming up who was Todd Caldwell talking about . Turns out there was someone in seth and lisas life who had everybody worried. Things were escalating. They were fearful. I was fearful. Reporter when dateline continues. A whole new way to treat sensitivity. Thats 1 strip. 10 minutes. And up to 1 month of protection. Satisfaction guaranteed. Life opens up when you relieve sensitivity. [ siri] hello. Wh[cortana] name . Hello siri. Im cortana. Weve already met. Im sorry. I dont remember. Thats ok. I can remember lots of things. Like your favorite kinds of restaurants. I cannot remember that. I can remember appointments and help you get there on time. Or that. Or remember favorite news topics. Or that either. Siri, what can you remember . I remember when i was the only phone that talked. Looking for one of these . Yoplait. Smooth, creamy, and craved by the whole family. Reporter lisa techel was dead, murdered in her own bed. Her distraught husband seth was outside shirtless and barefoot. When lisas little sister presley arrived, all she could do was try to comfort him. By the time i got there, they had stuff taped off. And i went up and i just gave seth, like, the longest it seemed like the longest hug ever. Your best friend. Yup. Reporter seth was inconsolable, and acting out. I went over to him when i first got there and i tried hugging him. He pushed me away. He punched his truck, and i said, dont do that, seth, you know, let me see your hand. Reporter todd offered to take seth back to his house, but doug techel knew this was a moment his son should be with him. Was just bad. I mean, it he was sobbing. And we just hugged and cried. Reporter marty wonderlin, working his first homicide, was the first deputy to speak to seth. Hows that go . You know, i ask him what happened. I came running out. And i looked in the bedroom and shes [bleep] laying there. Reporter through the overwrought husbands sobbing, a story started to emerge. He basically tells me that he was in the shower gettin ready to go to work, and he hears a gun go off. I ripped open the [bleep] shower curtain and i grabbed my towel and i came out. I didnt see anybody down the hallway. Im gonna kill whoever the f did this. Theres been some sort of an intruder. Yeah, thats what hes tellin me, that someone came in while he was in the shower, shot lisa and ran away before he could catch him. Well figure it out, brother. I cant [bleep] tell todd. Well figure it out. Reporter lisas father todd thought hed figured it out. And already had a suspect. Go get him. Go get him. Now. Reporter todds rage was directed at the neighbor on the other side of the fence topped with barbed wire. A 56yearold disabled army veteran named brian tate. I just remember saying, go get him. Go get him now, and i thought, they better get to him before i do. Reporter brian tate had been embroiled in an escalating feud with his neighbors lisa and seth. Todd knew all about it, and was certain his daughter was now dead because of it. This is this culmination of bad bloods been goin on for a months time or more now . Uhhuh. Reporter it started about two months before the murder. Seth pulled a dead deer off the road along the property line. Brian tate later tossed the hide onto seths property. Seth tossed it back, and the battle was on. Tate made several calls to the county, complaining about nasty acts of vandalism. Todd caldwell responded to one in april. And tate pointed the finger at his young neighbor. I cant remember names. Seth, seth techel. Seth techel . Yep. Torkel . Techel. Techel. Yeah, his dad owns champion bowl. Okay. And ill tell i just theyre good people. They really are. Now this guy, brian tate, does he know that youre the fatherinlaw of the neighbor . No, and i dont wanna tell him that because i dont want that to effect maybe what he does or doesnt do. And he thinks thats the source of his trouble . Right. Those people over in the trailer property across the way . Yeah. Well, if you can, let us deal with it. What if what if what if im the one whos gotta catch him . Reporter 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 stark terms. He says that he thinks these are acts of terrorism and, you know, kind of a bell goes off like, terrorisms kind of a weird word to use. And the whole time half the time, i guess, hes sitting there. Hes i s i notice a shotgun layin on the ground, you know . And im like goin that makes me feel a little does that make you a little twitchy . Yeah. Yeah. Exactly. Reporter so twitchy that todd sent a headsup email warning fellow deputies about tate, that he might be dangerous. Im thinkin, i dont wanna be the reason a deputy goes out okay, if you go out there, be careful. Tate might be 1096 which means mentally, you know, challenged. Reporter in fact, tate did have a history of mental illness. Hed been diagnosed as a paranoid schizophrenic. Seths mother lorraine, a social worker, used to dealing with men