CNN—More is being learned about the alleged shooter at Fort Hood.

Major nidal hasan was a veteran army psychiatrist who counseled soldiers with post traumatic stress disorders.

But, he had some troubles in the past and reportedly was worried about his pending deployment to Afghanistan.

Video from a convenient store shows the suspected shooter just hours before he allegedly opened fire on a room full of U.S. soldiers.

The store owner identified Maj. Nidal Hasan as a regular at the 7-11.

The 39-year-old psychiatrist appears to be calm, even smiling, as he buys his morning coffee.

Just seven hours later, the Army says he made his way here to the Family Readiness Center, armed with two hand guns including a semi-automatic, shot a dozen people dead, wounded 30 and plunged the world’s largest military post into chaos.

The Army has said little about the man or his motive.

“We’ve asked for assistance from federal agencies to make sure that we have this investigation right,” said Lt. Gen. Bob Cone, a Fort Hood Commander.

But we’ve learned that Hasan might have been known to authorities for some time.

Six months ago federal law enforcement officials reportedly came across an internet posting signed with Hasan’s name, discussing suicide bombings and other threats.

We’ve also learned that Hasan was apparently unhappy about his upcoming deployment to Iraq, telling a cousin he was “mortified” by the idea.

Military records reveal a career that spanned more than a decade.

Born in Virginia of Jordanian descent — Hasan graduated from Virginia Tech in 1997 with a degree in biochemistry. He received his first appointment to the army that same year.

Six years later he began work at the Walter Reed Medical Center, pursuing a career in psychiatry and counseling scores of soldiers with post traumatic stress.

Hasan received at least three medals during this time, and neighbors near Walter Reed remembered him as easy going.

But there are also reports that Hasan received a bad performance review at Walter Reed and was forced to undergo counseling and increased supervision.

His family has also said he was harassed by other soldiers for being Muslim, a frustration that they say caused him to rethink his career in the military.

He apparently had been thinking about this for some time since 9-11 when he first told his family about the taunting.