after 40 minutes or so, yvonne shull started with the hard questions.onted paul with the phony insurance claim on linda's watch. so right there in that room, he's basically copping to insurance fraud. yes. which is way less serious than murder, but-- but it's still a crime. josh mankiewicz: but when it came to linda's death, paul seemed like a man with nothing to hide. in fact, he was the one who brought up the incidents with the ivs. shull wanted an explanation, too, but first, she wanted a reaction. she played linda's 1993 interview with detectives for paul. obviously. >> comments, and it was nostalgic to hear her voice. yes. he's a cool customer. yes. josh mankiewicz: but now, it was time to ask the biggest question of all. kill linda? >> absolutely not. it's an open mystery. i mean, it's an unsolved. death, but. unsolved. death, but. >> and now, you show him the report saying she had to die within two hours of getting the nicotine. right. josh mankiewicz: the man who'd always had all the answers suddenly had none. he still thinks he's gonna walk out