Gavin Long, the man from Kansas City who shot and killed three police officers in Baton Rouge, Louisiana, suffered from post-traumatic stress disorder, according to CNN sources.
Officials say Long joined the Marine Corps in 2005 and worked as a data network specialist.
After serving in Iraq, he was discharged at the rank of a sergeant in 2010.
Sources also say Long had filled a prescription for Ativan, an anti-anxiety drug, as recently as June. He also had prescriptions for Valium and Lunesta.
This story is developing. Stay with 41 Action News for the latest.