sidney. however, the jury deadlocked. >> a mistrial has been declared in this case against sydney moorer. 's trial, they came up with a bold new strategy. they argue that tammy had not only been sidney's partner in crime, she'd been the mastermind calling all the shots. >> they believed that she was the ultimate brains behind this whole plan. >> prosecutors said it all boiled down to this. far from being the understanding wife who had accepted sydney's affair, tammy had been consumed by it. >> a fire of jealousy was lit in the defendant. she was livid. she was angry. >> and anchor that became something more sinister when tammy heard a rumor around town. heather might be pregnant with sydney's baby. >> when this gets out and it becomes common knowledge, the fire, the jealousy that is in tammy moorer explodes into utter rage. >> prosecutors said that that rage wouldn't be satisfied until heather was out of the way. they said it was obvious how much the affair had upset tammy by the way she had treated sydney afterwards. >> she said she beat the hell out of him. >> this witness said sydney ha