>> it was diana loafjoy. >> diana lovejoy. soon to be ex-wife. >> is this a smoking gun, getting this photo of diana lovejoy? >> it points us in a direction. there's a lot more to be done. >> sargeant ernst team searches for more. >> police had enough to arrest diana and bring her in for questioning. at first she denied any involvement in the shooting. >> what is her alibi? >> that she was at home all night long. she never went out. >> police realized she might be telling the truth about that. just because she bought the tracfone doesn't mean she was at the crime scene. >> diana was most likely not the person lying in the grass in camouflage with a rifle, fair to say. >> yes. yes. >> did you ask her if she hired someone to kill greg? >> yes. yes. no, i did not. >> detectives pressed her and diana told them something they didn't expect. >> she starts to describe her relationship with her shooting instru instructor. >> diana told police her instructor's name, weldon mcdavid. >> he had volunteered to help her protect herself from