if oswalt murdered margie coffey, why did he do it? en birth to her second child, brandon, she told social services she couldn't identify the baby's father since the pregnancy was the result of a rape. but later when she applied for financial aid at college, she was required to identify brandon's father and explain why she wasn't receiving child support. >> when she became a jehovah's witness and they began to counsel with her, they found these details out. they said, look, you can't lie. you're to tell the truth, and she named chuck oswalt as the father. >> with this news, prosecutors asked oswalt to undergo a paternity test. it revealed that the likelihood of oswalt being brandon's father was greater than 99%. investigators also discovered that oswalt had refused to pay for child support when margie asked, possibly because he didn't want his wife to find out about his infidelity. >> lieutenant oswalt was married, had children. in fact, up until all of this, his wife didn't know anything about margie coffey, did not know he had a child