alex mccarty tells detectives about a secret riley shared with him saturday, just before emma died. > ended up telling me like that night, that he was so fearful for his life that he had stolen his grandfather's gun and he showed it to me. >> reporter: he showed you his grandfather's gun? >> yes, and i held it in my hand that night. >> reporter: so he's been acting strangely, and then he shows you a gun. how worried were you about him? >> i was very worried. he reassured me over and over again that he was the farthest thing from suicidal. he was just so scared of these people who were out to get him, were out to get emma. >> reporter: riley insists he needs the gun to protect himself and emma from those supposed kidnappers. and the man in black pounding at emma's door. what did you hear from the friends about what struck them as odd? >> a person dressed all in black, head to toe, even sunglasses, a hoodie on, face covered, goes to emma's house, tries to get in, scares her. >> reporter: did you think maybe there was some other suspect out there, who had been stalking her? >> sure. >> r