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an intruder. >> their home so deep in the woods now shrouded in a mystery even deeper. police had suspects. >> i remember kelley not wanting to be home alone. >> they also had a problem. >> why would this guy go up and kill this woman? >> her family had questions of their own. >> something is not right here. something is wrong. >> and then someone remembered a phone call and a fib. >> i pulled out my phone. i'm like that's strange. >> a killer living two lives. >> it hurts when you thought you knew was all a lie. hello and welcome to dateline. kelley and tom clayton seemingly happy l...

Opportunity just to start anew. >> reporter: the millers listened and wondered how they could be so wrong about their old friend tom clayton. >> we didn't obviously know until the trial of the affairs and stuff. >> you really didn't know tom at all? >> no. >> correct. correct. >> that's the scary part. >> reporter: after seven weeks the case went to the jury. kelley's sister and the prosecutor braced themselves. >> now we wait. >> reporter: but not for long. it took jurors just six hours to make their decision. as they filed back into the courtroom, the reporter noticed a change in tom clayton...

And he told me that he also was getting close to a divorce. he just wanted to be done. >> reporter: the prosecutor told the jury this was tom's motive. he wanted to get rid of his wife but keep everything else. >> i think he was concerned that his wife, if they went through a divorce, that she probably would get everything and this was an opportunity just to start anew. >> reporter: the millers listened and wondered how they could be so wrong about their old friend tom clayton. >> we didn't obviously know until the trial of the affairs and stuff. >> you really didn't know tom at all? >> no. >>...

The jury this was tom's motive. he wanted to get rid of his wife but keep everything else. >> i think he was concerned that his wife, if they went through a divorce, that she probably would get everything and this was an opportunity just to start anew. >> reporter: the millers listened and wondered how they could be so wrong about their old friend tom clayton. >> we didn't obviously know until the trial of the affairs and stuff. >> you really didn't know tom at all? >> no. >> correct. correct. >> that's the scary part. >> reporter: after seven weeks the case went to the jury. kelley's sister a...

Getting close to a divorce. he just wanted to be done. >> reporter: the prosecutor told the jury this was tom's motive. he wanted to get rid of his wife but keep everything else. >> i think he was concerned that his wife, if they went through a divorce, that she probably would get everything and this was an opportunity just to start anew. >> reporter: the millers listened and wondered how they could be so wrong about their old friend tom clayton. >> we didn't obviously know until the trial of the affairs and stuff. >> you really didn't know tom at all? >> no. >> correct. correct. >> that's the...