investigators also heard from lloyd mccracken that thomas shared his daughter's rage at stephen.ng, all the yelling, the screaming, the threats. >> reporter: and during kathleen's arrest, thomas did something the investigators all noticed. >> as soon as we entered into the residence, thomas dorsett removed his wallet from his back pocket and as if he was gonna turn it over like. "let me --." >> as if he was --. >> exactly. like, "let me get rid of my property right now." >> he was gonna get arrested was what it looked like. >> right. >> reporter: but more than anything, the prosecutor focused on the cause of stephen's death: blunt force trauma and strangulation. >> what was the significance of the injuries? >> the significance of that led us to clearly know that this was something more than just kathleen being involved. >> reporter: but police still didn't have any hard evidence to connect thomas to the crime until -- >> there was a phone call that came in from a restaurant owner in long branch -- >> reporter: this restaurant owner had some videotape he said, that might be of int