Aaron Alexis, 34, of Fort Worth, Texas, has been named as the deceased shooter in the Washington Navy Yard shooting massacre that rocked the nation's capital this morning.
At least 12 people are dead, and despite varying reports of additional gunmen, it now appears Alexis may have acted alone.
There is no known motive for the rampage.
Here's what we know so far about Aaron Alexis.
This is a breaking story. Stay tuned for updates.
1. A man matching his age, description and place of residence was arrested in 2010 in Fort Worth, Texas, for discharging a firearm — as seen on bustedmugshots:

The AP's reporting on Alexis' past arrest matches the bustedmugshots info but notes he was never charged:
Tarrant County court records show Alexis was arrested in Sept. 2010 for allegedly discharging a firearm within a municipality. The records do not indicate that Alexis was ever formally charged in the case.
AP also reports Alexis held a concealed-carry weapons permit.
2. He reportedly entered the base using someone else's ID.
@PeteWilliamsNBC reporting suspect is 34yr old Aaron Alexis who was a civilian contractor from Texas & he stole ID to get into #DCNavyYard
— Ryan Schulteis (@RyanSchulteis) September 16, 2013
3. Alexis is reportedly a former civilian military contractor. The AP reports court records show he was being evicted in 2010 from the Orion at Oak Hill apartments — a gated community in Fort Worth, Texas.
4. His body was identified by checking his fingerprints.
5. A removed LinkedIn profile for an Aaron Alexis in the Fort Worth area shows a former Nave employee.
Interesting. Aaron Alexis from Fort Worth shows up in LinkedIn as a former Navy employee, but the profile was removed pic.twitter.com/K1WOSBJccb
— Pafford (@pafford) September 16, 2013
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