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>> they're saying it was a homicide. >> then police found something else. revealing recordings. >> everything changed like instantly. it's weird. >> brittany is essentially speaking from the grave. >> you could see the emotions she went through. >> could she point police to her killer? >> i am scared to death. all at once just in a flash your life just changed. >> hello, welcome to "dateline." it started with a little flirtation in the office and bloomed into a full-blown romance. problem was, brittany eldridge was married to another man then brittany found out she was pregnant and i...

>> why are you talking like you're trying to hide something. >> reporter: this story begins here at a suburban office outside knoxville, tennessee. looks a lot like any office in america. but when workers here talked on their desk phones, every word was captured. >> she always looks like she's about to kill be. >> and, oh, the stories they told. unfiltered and intimate with details about office romances. >> oh, my god, he was so hot. >> and in one heartbreaking case, maybe even clues about a murder. >> this was a real whodunit. >> norman clark loves sports. his mother says he was a top athlete...

>> imagine all of your phone conversations being recorded for posterity? how would you feel. what secrets would they tell? >> why are you talking like you're trying to hide something. >> reporter: this story begins here at a suburban office outside knoxville, tennessee. looks a lot like any office in america. but when workers here talked on their desk phones, every word was captured. >> she always looks like she's about to kill be. >> and, oh, the stories they told. unfiltered and intimate with details about office romances. >> oh, my god, he was so hot. >> and in one heartbreaking case, maybe...