KING

Seattle FBI's mystery man has been identified as Scott Andrew Shain.

SEATTLE - A Seattle man who has lived under so many assumed names, even federal investigators were not sure who he is or what he has been up to, has been identified.

KING 5 News has learned he is Scott Andrew Shain, born in 1955.  The FBI says Shain was identified thanks to the help of the Social Security Administration.  His parents apparently identified him by checking his picture on the FBI website.

Agents still don't know the full extent of his criminal background, but they do know that he served in the U.S. Air Force and was from Boston.

For the last couple of years, Shain lived in a tiny, unkempt apartment on Lower Queen Anne.

Neighbor Linda Seravo often wondered about the strange man who lived down the hall from her.

"He just always scrambled around with his head down," she said.

Shain is now in federal custody on multiple counts of aggravated identity theft, such as stealing a dead man's identity.

"We determined he was using several identities and to this point we still don't know who he is," said FBI Assistant Agent-in-Charge FBI Steven Dean before Shain was positively identified.

Federal authorities say Shain went by names including William Gee and Dwayne Spill. He had more than 30 aliases in all. According to reports, one of the identities he used was "Blake Mattheww Desmond" who has an active 1998 warrant for forgery in King County.

He first aroused suspicions last year in Vancouver, B.C., when he requested a copy of a birth certificate, claiming to be someone who was actually dead.

Agents traced his trail of aliases to Seattle, where he's still wanted on a 1998 warrant. They've linked him to criminal convictions and rap sheets under assumed names in other states.

Authorities arrested him a week ago at a Postal Express delivery in Kirkland, where he worked as driver named Bob Lowe.