NEW: Lindsay Clancy's defense is nearing the end of its case as jurors hear competing accounts over one of the trial's biggest questions: Did she hear a voice c

NEW: Lindsay Clancy's defense is nearing the end of its case as jurors hear competing accounts over one of the trial's biggest questions: Did she hear a voice commanding her to kill her three children? Three defense witnesses say Clancy described a male voice giving her that command. But prosecutor…