josh mankiewicz: baytieh's theory?tested different poisons, carefully picked an obscure one, then poisoned himself to cover his tracks. the first time linda got sick, he had the exact same symptoms, because that allows him to say, hey, look, we both got sick. maybe we both caught something. and you think that's him thinking ahead. that's his mo. josh mankiewicz: baytieh went back to the night linda died and the nicotine that killed her. he consulted a nicotine expert who had looked into the case back in 1994. goes, yeah, i remember the case. nobody ever followed up with me. i go, would you kindly please be willing to write a report to us about your interpretation of the result? josh mankiewicz: it turned out to be the breakthrough baytieh needed. the amount of nicotine in linda's blood was extraordinarily high, nearly 100 times what you'd find in a regular smoker. forensic toxicologist sabra botch-jones. for the amount that was found in those specimens, it could take a matter of minutes to reach death. josh mankiewicz: