New details emerged Thursday about the man who went on a shooting rampage in Fort Hood Wednesday.
Three people were killed and 16 others were wounded before a 34-year-old turned the gun on himself.
Officials say Army Specialist Ivan Lopez had a history of psychiatric issues, which may have been a factor in the attack.
Fort Hood shooter was Iraq vet being treated for mental health issues
The incident was the second major shooting at Ford Hood in less than five years.
Many are now asking how this happened again.
CNN's Ed Lavandera is OutFront.
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