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>> reporter: but trouble in the family didn't stop with derrick. >> there seemed to be a riff. >> reporter: but not between dee and ken. theirs seemed to be a genuine love story. but now a grieving dee told detectives she was as baffled about the murder as they were. >> she was not able to provide us any information as to who he was meeting that day or anything about his day. >> reporter: and despite all that friction, the infighting over money and control, dee's family produced not a single viable suspect, not even ken's step-son. >> derrick had an alibi at the time of the murder. >> reporter...

Know why the police didn't seem to follow up on that or probe more deeply into all that tension of dee mower's family. odd. all of it. the feeling, to them, that something was missing. that the case against chris simply didn't hold together. so as chris' trial finally got under way, bianca felt her husband was as good as home. >> i was just, like, brilliant, you know, we now, you know, they go away, they do their thing, they come back and i get my husband back. coming up -- chris wright makes his case to "dateline." taking on that voicemail message central to the case. was it his voice? >> t...

No clue who he was meeting with. turns out, she was not telling the truth. >> hello? >> you have a call from an inmate. >> hello? >> hi, honey. >> it's standard procedure for prisons to record inmates' phone calls. this is ken talking to his wife, dee, night before his murder. >> i'm actually meeting with my friend tomorrow at 7:00 a.m., go figure that out. >> i love it. >> yeah, exactly. so tomorrow morning, 7:00 a.m., so tomorrow night i should know more. >> police confronted dee in prison. recorded the interview. in it, she claimed the stress of losing her husband caused her to forget about...

>> reporter: the day and time at which ken dolezsar was shot to death. was the caller also the killer? if so, they now had his voice because earlier that caller left this phone message. >> hey, ken, this is robert. i talked to dave. he said when you get to -- >> reporter: detectives traced the cell and went to the store where someone bought it. >> this phone was purchased with cash with no identifying information provided to the carrier. >> reporter: but the family did have a suggestion for the detectives, something they actually agreed on. he should look carefully at a man named david novak. ...

Fife, of a conversation with novak one night after they dined together. john posed a question, he said, mostly in jest, of course, just hypothetical. >> i said, david, have you ever contemplated committing the perfect murder? and he said, yes, the key element to that is making sure that someone is caught and charged with the crime. once they have somebody, they'll stop looking and that's how you can really get away. >> and now, novak had taken off. and even though their questions didn't amount to hard evidence, of course, chris' defense attorneys wondered as they prepared for the trial why the...