piece?" have you ever heard anybody respond like that? >> never. >> reporter: to a death notification. >> never. >> reporter: but it wouldn't be the only response that left sgt. reim scratching his head. >> so i'll let you talk to a detective and -- and we'll go from there, if you're good with that. >> i do have class. even though i know that's kind of insignificant at the moment. >> okay. yeah, i think -- i think you can get an excuse for that. >> reporter: igor never made it to class that night. instead, he was brought here to the frisco police department for a formal interview. investigators had already been briefed about his odd reaction to the news of his mother's death. later, he'd tell her friends he didn't want to have a funeral for her. and also this -- that whoever had killed anna moses should be forgiven. igor said he was in class the night his mom was murdered. but after interviewing him for five hours, investigators were still wondering about his unusual reaction. especially when they learned that right after the interview,