you know, they just couldn t control that he was leaving, and he left. he walked out the door, and chris said to me, i wish i could have stopped him, but i couldn t. reporter: but what was he grieving about? a notebook found near laundrie s remains could shed some light on that. a source telling cnn the notebook is possibly salvageable. we want to make sure that s handled as carefully as possible. you only get one shot at these types of items. reporter: according to the laundrie parents, their son left their home on september 13th. the laundries lawyer says he notified the fbi that same day their son had left, something law enforcement disputes. making a statement that we haven t seen him is not reporting someone missing. if we had that information, there s a million things we would have done differently. reporter: so did laundrie tell his family anything about petito before he left? that s not something i can comment on right now, and i d like to just leave it at that.
a notebook found they are laundrie s remains could shed some light on that. a source says the notebook is possibly salvageable. we want to make sure that s handled sass well as possible. reporter: their son left the home on september 13th.the laundrie lawyer said he notified the fbi the same day he left. something law enforcement disputes. making a statement that we haven t seen him is not reporting that information. there is a million things we would have done. reporter: did laundrie s family tell law enforcement anything about petito before he left? that s not something that i can comment on right now and just leave it at that. reporter: we sktill don t knw when laundrie died. they discussed the possibility that it could have been a possibility. we had that conversation, chris, roberta and myself several times. we just do not know. of course, knowing his mental
reporter: what was he grieving about? a notebook found near laundrie s remains could shed light on that, a source telling cnn the notebook is possibly salvageable. you want to make sure you handle it as carefully as possible, you only get one shot at these types of items. reporter: according to the laundrie parents, their son left their home on september 13. the lawyer says he notified the fbi the same day that their son had left, something law enforcement disputes. making a statement that we haven t seen him is not reporting someone missing. if we had had that information, there s a million things we would have done differently. reporter: did laundrie tell his family anything about petito before he left? that s not something i can comment on right now, and, uh, i would like to just leave it at that. reporter: tonight we still don t know how laundrie died. the family s lawyer says he and brian s parents discussed the possibility that it could have been a suicide. you kn