he should look carefully at a man named david novak. yes, that david novak.emember novak's consulting business for prison-pound executives? guess what? >> dee mower was incarcerated in federal prison. >> reporter: tax fraud. ken's wealthy wife dee was novak's client. that's why ken dolezsar knew ken novak. and something made ken's relatives suspicious. so detectives drove over to the loft where they spoke with mr. novak. >> he was soft spoken. >> reporter: and a bright man. >> he came across as very intelligent, yes. >> reporter: answered all the questions but didn't seem to be of much help. then as detective carriger was preparing to leave, he tried one more question. that prepaid cell phone, the one someone used to invite ken to the fatal meeting, the store had surveillance video of a man buying that very phone. ken's family set they didn't recognize him, but would novak? carriger showed him the photo. >> we asked who is that? he says he's my neighbor. he lives two floors below. >> reporter: and just like that, a big piece of the puzzle plopped into place.