watching them. reporter: surveillance video show dawn with james and her two daughters, brandy, her 13-year-old daughter from a previous marriage and alyssa 7 by this time. that s right. a year into the investigation, little alyssa was back with her biological mom who had then the courts weaned her back there permanently. so there you are still trying to grieve the loss of ben, at the same time alyssa is being pulled back toward dawn? yeah. i lost both of them, truly. reporter: and, well, while the police were watching dawn, they were selling them that real suspect is melissa. she confidently told you it was melissa that committed this murder? yes. reporter: brandy was hearing that from her mother, dawn, you could see was drinking too much, getting duis, spending more than a few nights in jail. they started getting arrested, dawn and james both. we were finding reasons to take them to jail. reporter: and while they had james, they asked him point blank about the murder of