remember michael minor's videotaped break-in of dianne mcknight's apartment? d plan the break-in, but she also instructed michael to steal some of dianne's possessions. danielle was charged with burglary and theft. at trial, the defense argued danielle never asked michael to steal anything. the jury didn't agree. she was found guilty as charged and sentenced to four years in prison. >> this was a very satisfying verdict, to see the woman be punished for her actions. >> reporter: is the murder of sam dreher an open case or a closed case? >> no. it's a closed case. >> reporter: but not for cindy, who continues to mourn the loss of her brother. she keeps his uniform close by for comfort and, with it, a lifetime of memories. >> he was loving. he was caring. he was the peacemaker. he was always doing for others. he was just sweet. >> reporter: cindy once felt the same way about her sister-in-law danielle. now there's bad blood between the two. cindy fought danielle in court over benefits from sam's life insurance. they ultimately reached a confidential settlement. c

they learned dianne was holding on to a secret. >> it turns out that the witness, dianne mcknight, wasthan just a witness. she was very important to this case. >> yes, she was. >> reporter: dianne revealed that she knew sam, intimately. >> she admitted that they were boyfriend and girlfriend. she had stated that they had only been dating for a few months. and stated that they were in love. >> reporter: so sam was having an affair? >> yes. >> reporter: which is why sam was at the apartment complex that day. >> there's some infidelity going on. and there's a reason -- a cause for concern. >> reporter: did you ever think that you'd be the kind of person to have an affair? >> no. >> reporter: dianne told the detectives her affair with sam started as affairs so often do, with an innocent encounter at a bar. >> he asked me if i was married and had kids, and i told him that i was but no kids. and i'm like, what about you? he said, yes, married. >> reporter: in fact, sam had been married for 13 years. but according to dianne, it took just a month for sam to fall in love with her. and, she said