VIDEO – Who Was the gunman, Aaron Alexis – A former Navy reservist with a “pattern of misconduct”

The gunman was identified as 34-year-old Aaron Alexis, a former Navy reservist and a current military contractor, the Washington FBI Field Office told CNN. His identity was confirmed by fingerprints and a picture ID card, the FBI said.

Authorities have not released a possible motive in the morning shooting at the headquarters for Naval Sea Systems Command that left more than a dozen people, including the gunman, dead. But a friend said Alexis was locked in a dispute over money with the company that contracted him to work for the Navy.

By nightfall, authorities said they were “confident” that Alexis was the lone gunman, bringing to an end a day-long police search for a possible second suspect.