The judge in the Drew Peterson murder trial is considering declaring a mistrial for a second time after a witness mentioned another murder investigation. Peterson is accused of killing his third wife Kathleen Savio. During testimony, a witness referenced that Peterson is also a suspect in the disappearance of his fourth wife Stacy Peterson. The judge had previously barred any mention of Stacy Peterson's disappearance due to it being a separate case. Peterson's defense argued the comment was grounds for a mistrial, while prosecutors disagreed. The judge did not immediately rule and is continuing to weigh options.