is this a smoking gun, getting this photo of diana lovejoy? nitely points us in a direction. so there's a lot more to be done. >> reporter: sergeant ernst's team searched for more evidence in diana's home. >> we were able to locate the clothing that she was wearing when she purchased the phone. >> reporter: 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. >> reporter: and police realized police realized she may be telling the truth about that. just because she brought the trak phone didn't mean she was at the crime scene. >> because diana was most likely not the person lying in the grass in camouflage, with a rifle, fair to say. ? >> fair to say. >> did you ask her if she hired somebody to kill greg? >> yes, no i did not. >> reporter: detectives pressed her and diana told them something she did not expect. >> she start -- she starts to describe her relationship with her shooting instructor. he v