Connecticut School Shooting: Shooter's home offers clues to motive (VIDEO)

(CBS) Newtown, Conn. - "CBS This Morning" senior correspondent John Miller reports on the latest developments in the investigation of the attack at Sandy Hook Elementary School, in Newtown, Connecticut on Friday.

Pictures: Conn. elementary school shooting

Miller says there have been reports that Adam Lanza, the shooting suspect, showed up at the school door and was buzzed in. He also notes there have been reports that he shot out a window and either walked through the glass or opened the door there.

According to Miller, investigators entered Adama Lanza's home that he shared with his mother, who was found fatally shot in the face at the residence, and found the 20-year-old's room "immaculate, everything was folded and put away, nothing strewn around."

Miller says it seems "telling in some ways, of the organized personality of someone who would go to such intricate and detailed planning for such a terrible crime."