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Now, back to "dateline." welcome back. i'm craig melvin. with very little evidence found at the scene of brook morris's murder, data from her cell phone showed she had been in contact with two men the day she was killed. could one of them be responsible for her murder or was this another dead end? >> reporter: the brutality of brooke morris's murder fueled the search for her killer. >> we really hate that they came into our community and committed such a crime. >> reporter: roane county investigators had cleared brooke's ex-husband, clayton. but they had two other men to look at, two men who...

Saturday and then spent the evening at home. >> could he have left the child and gone out? >> he could have. ♪ coming up: >> scouring the scene of the crime. bullets and brooke's phone. what will they reveal? >> very helpful to us. when "dateline" continues. . . like an "unjection™". xeljanz xr. a once daily pill for adults with moderate to severe ra for whom methotrexate did not work well. xeljanz xr can reduce pain, swelling and further joint damage, even without methotrexate. xeljanz xr can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal infe...

When "dateline" continues.

That would turn out to be crucial. unlikely call. cat lack leads to unlikely clue. when date line continues.

Wanting to harm herself or anybody else that you -- since you've known her? >> not that i recall. >> reporter: friends and family police spoke to were adamant that heather would not take her own life. not after striving so hard to transform it for the better. but there was another possible explanation for what might have happened to this woman who had built such a promising future. police were about to uncover a secret she'd kept hidden from almost everyone. >> i didn't even know his name. >> reporter: just as heather was headed off into that bright new future, her past came calling. coming ...