The lawsuit on behalf of the family of Mary DeLorenzo Knight was filed Wednesday. The lawsuit was originally filed in federal court in Tampa, but lawyers say it was refiled in state court due to jurisdictional issues.
Mary DeLorenzo Knight was one of 12 people killed by Aaron Alexis on Sept. 16, 2013 before he was killed in a shootout with police.
The lawsuit says the contractor that Alexis worked for should have told the Navy about his prior, and documented, mental health problems and that the Navy should not have given him security clearance.
Knight, 51, was an IT contractor for the military who also taught at Northern Virginia Community College. She was a Seventy-First High School graduate, and the mother of two. She was working as an IT specialist in the Navy Yard when she was killed.