. >> reporter: investigator randy boland was assigned to talk to her. >> she is crying and very, veryi immediately go and speak to her but i give her some moments. >> reporter: but in the investigator's eyes, kimberly quickly went from grieving girlfriend to potential suspect. he asked for her phone. >> i said, okay is there a reason why? you know, i just was kind of shocked. >> reporter: it turns out keith had asked kimberly to join him at the educator's conference that weekend. she said they had never finalized the plan but she had been mad at him for not returning her calls. >> she gets very upset in her text messages back, like, i can't believe you're not talking to me. you know, and they are like half-violent, like why are you -- why are you not calling me? >> really flaming stuff, huh? >> yeah. >> reporter: and something else. in keith's bedroom upstairs, crime scene analysts noticed this picture frame. it was toppled over and taken apart on a bookcase. whatever picture had been in it was gone. you can put a story together with that pretty easily, huh? >> the pieces of the puzzl