problem was, brittany eldridge was married to another man. she found out that she was pregnant. and it was just weeks before her due date that the tragedy struck. investigators would quickly hone in on the two men in her life. but was either capable of murder? here's andrea canning with. deadly circumstances. >> imagine all your phone conversations being recorded for posterity. how would you feel? what secrets what they tell? >> why were you talking like you're trying to hide something? >> this story begins here. at a suburban office outside of knoxville, tennessee. it looks like any of us in america. but when workers here talked on their desks, phones every word was captured. >> she always looks like she's adopted sums of money. >> and oh, the stories that they told. unfiltered an 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 whodunnit. >> norman clark loved sports, his mother says that he was a top athletes and a good sun to.