Investigators are looking into puzzling new clues surrounding the Navy Yard gunman Aaron Alexis. Mental health advocate Terrie Williams talks about the role mental illness may have played in the massacre.Sept. 19, 2013
UP NEXT
FBI says three bodies were found in Mexico after disappearance of American and two Australians
01:30
Rep. Henry Cuellar of Texas indicted in bribery scheme
00:35
Families of victims speak out after nurse pleads guilty to killing patients
01:34
California superintendent fired after allegedly bullying students
02:32
'Outbreak' of opioid overdoses kills 8 people in Austin, Texas
01:33
Police fire tear gas on University of Southern Florida protesters