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go get him! 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. here s 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. i m lester holt and this is dateline. here s 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 beca ....
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. here s 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. i m lester holt and this is dateline. here s 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 the fence. a husband s lust did he tell you, she sent me some topless pictures? yes. did you see them? yes. reporter: then, a wife s double life exposed. that was her biggest secret. a case that would test three juries and shatter two families. before uncovering one terrifying truth reporter: this has gotta be just more than your brain can absorb. definitely. it s heartbreaking. just like somebody hit me in the stomach. 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. yup, 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 hadn t shut up. reporter: they re divorced now but tracy and todd caldwell watched t ....
a husband s lust did he tell you, she sent me some topless pictures? yes. did you see them? yes. reporter: then, a wife s double life exposed. that was her biggest secret. a case that would test three juries and shatter two families. before uncovering one terrifying truth reporter: this has gotta be just more than your brain can absorb. definitely. it s heartbreaking. just like somebody hit me in the stomach. 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. yup, 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 hadn t shut up. reporter: they re divorced now but tracy and todd caldwell watched their girl grow ....
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. here s 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. i m lester holt and this is dateline. here s 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, ....