sarah dutra was behind bars charged with the murder of larry mcnabney. sarah's idea and then elisa committed suicide leaving sarah to face trial alone. sarah's defense claimed she was the pawn, forced to commit the horrendous act and it was elisa who was the real mastermind. which story would the jury believe? here's keith morrison with the conclusion of "poison." >> it was the winter of the 2003, more than a year after larry was poisoned with horse tranquilizer. his admitted killer, his wife. you attended the trial every day. >> yes, 11 1/2 weeks. >> why? why? >> our da had talked to us about the importance of our family being represented, that my dad not being forgotten. >> she believed her father died at the hands of both elisa and sarah. but though sarah admitted to being there when larry died in the and days and months that followed she adamantly claimed she never went to the police because she was so afraid of elisa and of ending up just like larry. and theory that even the prosecutor found believable. >> when i first got this case people in my offi