hunter would not give up his cell phone. >> that's like wearing a sandwich board saying, "be suspicious of me." >> so it's friday night, but they're not going out together. and he doesn't call when she's missing. and he won't let you download his phone. is that about right? >> that's all true. >> reporter: christina's mom also found hunter's behavior very odd. and she confronted him about it. >> i need to know why you didn't call, why you didn't check on her? yeah. i flipped out. >> i got little anxiety right now. >> reporter: jonni kept pressing hunter for details about that night. >> you kept in touch with him. you stayed in contact. >>yes. if he was responsible, i'm going to keep that enemy closer, so i wasn't going to let him out of my sight. >> reporter: jonni wasn't giving up. neither was christina's stepmom anna. >> somebody's seen her. something is somewhere. we just need that little bit of