on the 15th. >> reporter: the day and time at which ken dolezsar was shot to death. s the caller also the killer? if so, they now had his voice because earlier that caller left this phone message. >> hey, ken, this is robert. i talked to dave. he said when you get to -- >> reporter: detectives traced the prepaid cell which the call came and went to the store where someone bought it. >> this phone was purchased with cash with no identifying information provided to the carrier. >> reporter: but the family did have a suggestion for the detectives, something they actually agreed on. he should look carefully at a man named david novak. yes, that david novak. remember novak's consulting business for prison-bound executives? guess what? >> dee mower was incarcerated in federal prison. >> reporter: tax fraud. ken's wealthy wife dee was david novak's client. that's why ken dolezsar knew david novak. 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: