pathological liar. >> members of the jury -- >> reporter: now the seven women and five men deliberate on the same courthouse floor where they've spent the last six weeks. they've listened to 91 witnesses and viewed well over 300 pieces of evidence. if they believe the prosecution, casey planned the murder. googling how to make chloroform, drugging little caylee, then covering her nose and mouth with duct tape, suffocating her, hiding theheody in her trunk before taking it to a nearby swamp. >> any way you slice it, casey anthony is guilty of murder in the first degree. >> reporter: her motives, obvivis in the days after her daughter disappeared as she papaied and even got a tattoo celebrating bella vita, the good life. >> whose life was better without caylee? there's your answer. >> reporter: if jurors are to side with the defense, they must believe this was an accident that spiraled out of control.