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As investigators searched for answers, the FBI released a bulletin asking for the public’s help in learning more about Alexis. The bulletin said that he was born in Queens, N.Y., and was 6 feet 1 inches tall, and weighed 190 pounds.

Valerie Parlave, assistant director of the FBI’s Washington field office, urged people to look at pictures of Alexis on the FBI’s website and to call with any information about him.

“No piece of information is too small,” she said. “We are looking to learn everything we can about his recent movements, his contacts and his associates. We ask the public to look at the photos of the deceased shooter.”

The Navy said Alexis joined the service in May 2007 and worked at the Naval Air Station Joint Reserve Base in Fort Worth, Texas. He was detached in January 2011. He had most recently worked in Fleet Logistics Support Squadron (VR) 46, in Fort Worth.

It was unclear why Alexis left the Navy. But during the time he served, he rose to the rank of aviation electrician’s mate 3rd class.

Alexis had at least two minor brushes with the law previously. In Fort Worth in 2010, he was charged with discharging a firearm, but the case wasn’t prosecuted.

In Seattle in 2004, he was charged with shooting out the tires of someone else’s car. Alexis told detectives he experienced an angry “blackout” after he felt some construction workers “disrespected” him.