>>> for years, clarence elkins sat in prison for a crime he claimed he didn't do while his wife melinda worked continuously to free him. >> so she endured tremendous skepticism and insults along the way. people feel that melinda somehow, some big publicity hog. >> the prosecutors wanted to portray me as a dumb old hick from the country who was trying to get this publicity and have my name out there and my face shown on tv as being my 15 minutes of fame. >> then one day, melinda picked up the morning newspaper and read an article about earl mann who had been convicted for sexuallily assaulting his three daughters. >> i when unit line and i pulled up his picture and i thought it was uncanny how clarence and him looked so similar. >> but that wasn't all. now melinda understood why her niece was forced to sit outside her neighbor's house for nearly an hour after the attack. because the house belonged to earl mann and his common law wife. >> a light bulb went off in my head and i'm thinking, wow, is this too unreal or not? what would be a normal person's reaction to a child showing up at you

. >> without melinda's efforts, let's face it, clarence elkins let's face it, clarence elkins would still be in prison. -- captions by vitac -- www.vitac.com >>> up next, a young woman is dead and the killer was a window peeper. >> she is uncomfortable about that. >> i had no idea how this could happen. >> despite the evidence, the case can't be solved. >> we're working on it but we don't have any viable leads at this time. >> until police found evidence their suspect had killed before. >> i don't think he was finished. i don't think he would have stopped. for stephanie bennett graduating from roanoke college was only the start. she took a job with ibm and was anxious to finally earn some money. >> she was really starting her life. she was a young woman with a lot of potential. she was excited about being on her own. >> but after working there for about a year, one day, she just didn't show up. >> she was a very responsible young woman. she was somebody that always showed up to work on time. when nobody could get in touch with her, everybody got concerned. >> so family members asked her a