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On Monday, Suthamtewakul reeled at the news that Alexis was believed to be a gunman in the rampage at the Navy Yard.

"I can't believe he did this," he said. "He never showed any sign of violence."

But there were signs that Alexis was unhappy. He was very frustrated with the company who contracted him to work for the Navy, according to a friend.

Alexis claimed he wasn't paid properly by the company after returning from a months-long assignment to Japan last year, said Michael Ritrovato, another former roommate.

It was unclear whether the dispute was over salary or expenses. Alexis just felt the company owed him money and had not paid him, Ritrovato said.

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http://www.cnn.com/2013/09/16/us/navy-yard-suspects/index.html?hpt=hp_t1