>> been up all night. >> i can't miss an opportunity. i didn't want to miss a chance, if she was going to come by. i didn't want to miss a knock on the door. >> sure. >> i'm worried. >> chris told detectives something that could be vital to the investigation. he said heather had written him an e-mail the night before. the subject read "i'm sorry." in it, she mentions their little girl, ava. it read, come get ava. i cannot face everyone with this. please forgive me. please remember me as their loving mommy. >> how concerned were you when chris told but this e-mail this his wife had sent, that heather had sent? >> i was concerned. it did not sound good to me. >> kemp came up with all kinds of interpretations, all bad. >> it seemed to me like, i am throwing in the towel. >> throwing in the towel? detective kemp asked chris if