>> he had a knife. >> despite herrington's shocking story, police had a problem. >> when darrell herringtoname forward and told his story, there wasn't enough probable cause to arrest randy or herb because they didn't feel confident that they could convict based on a guy like darrell herrington. >> but a few months later, another witness came forward, a local nursing aide who confessed she'd help steidl and whitlock stab the newly wed couple. >> okay, tell me what you saw happen. >> blood everywhere. >> where's herb and where's randy? >> one was on the right side of the bed, and one was by the door. >> when you walk into the bedroom, what was karen rhoads doing? >> she was yelling, oh, my god, oh, my god! >> reinboldt also gave police the murder weapon, a five-inch knife and agreed to testify in exchange for leniency. police now had enough to arrest steidl and whitlock. >> i think the brutal nature of the slayings, the fact that it was a double homicide, the other aggravating factors that our office will likely seek the death penalty. >> both herb whitlock, age 41 and randy steidl, age 35,