The gunman who shot and killed 12 people at a country music bar in Southern California is a former military machine gunner who was interviewed by mental health specialists this year after a neighbor reported a disturbance.
Ian David Long served in the Marines for nearly five years, including a seven-month tour in Afghanistan. The 28-year-old left as a corporal in March 2013 and recently was living with his mother in the Los Angeles suburb of Thousand Oaks.
Ventura County Sheriff Geoff Dean says a neighbor reported loud noises coming from Long's house in April and that deputies found a man "acting a little irrationally." They called a mental health specialist who assessed Long but concluded he couldn't be involuntarily committed for psychiatric observation.
Authorities haven't identified a motive for the attack.
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