The suspect in the Dec. 13 mass shooting on the campus of Brown University and the shooting of MIT professor Nuno Loureiro has been identified as 48-year-old Claudio Manuel Neves Valente, who was found dead by suicide inside a Salem, New Hampshire storage unit on Thursday night. A tipster who encountered Valente on a sidewalk outside Brown University and posted about it on Reddit provided crucial information that led to police identifying the suspect. CBS News' Tom Hanson breaks down what we kno