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This Feb. 6, 2010, photo provided by the Decoteau family shows an Army honor guard carrying the remains of Army Spc. Marc Decoteau into Plymouth Regional High School in Plymouth, N.H. Decoteau, who was killed his base in Afghanistan by a contract interpr Decoteau Family, Associated Press
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This December 2009 photo provided by the Thompson family shows Capt. David Johnpaul Thompson at home with his wife Emily, left, and daughters Isabelle and Abigail in Pinehurst, N.C. Thompson was killed in Jan. 2010 by Nasir Ahmad Ahmadi, an contract inter Thompson Family, Associated Press
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This February 2010 photo provided by the family of Army Capt. David Johnpaul Thompson shows Army Chief Warrant Officer Thomas Russell, wounded and recovering, by the side of his friend and commander Capt. Thompson inside a C-17 at Bagram Airfield, Afghani Thompson Family, Associated Press
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This January 2010, photo provided by the Russell family shows Army Chief Warrant Ofc. Thomas Russell at a field hospital in Afghanistan holding one of the bullets that hit him during an attack by interpreter Nasir Ahmad Ahmadi on his base in Afghanistan. Russell Family, Associated Press
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This image provided in response to a Freedom of Information Act request shows one of a series of a crime scene photos taken at Firebase Nunez in Afghanistan and included in the Army"™s investigative report into the Jan. 29, 2010, shooting attack by a base Department of Defense, Army CID, Associated Press
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This December 2010, photo provided by the Russell family shows Army Chief Warrant Officer Thomas Russell dressed for a formal unit event while in the U.S. Russell was wounded by a contract interpreter on his base in Afghanistan. Russell Family, Associated Press
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This Jan. 24, 2010, photo provided by the Decoteau family shows Army Spc. Marc Decoteau in a self-portrait in taken on base in Afghanistan. Decoteau, 19, was killed on base in Afghanistan by interpreter Nasir Ahmad Ahmadi at his base in Afghanistan. Just Marc Decoteau, Associated Press
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This image provided in response to a Freedom of Information Act request shows one of a series of a crime scene photos taken at Firebase Nunez in Afghanistan and included in the Army"™s investigative report into the Jan. 29, 2010, shooting attack by a base Department of Defense, Army CID, Associated Press
By Associated Press

WASHINGTON — The families of American soldiers killed and wounded by an interpreter in Afghanistan last year are suing the U.S. contractor that hired him, accusing the company of not properly testing him to ensure he was psychologically sound before giving him a job.

Filed Monday in federal court in North Carolina, the lawsuit says the interpreter, Nasir Ahmad Ahmadi, stole a rifle and shot and killed Specialist Marc Decoteau, 19, and Capt. David Johnpaul Thompson, 39. Ahmadi wounded Chief Warrant Officer Thomas Russell, 37, before an Army sergeant drew his pistol and killed Ahmadi.

Ahmadi was employed by Mission Essential Personnel of Columbus, Ohio. In a statement, the company said Ahmadi was screened thoroughly before being sent to Afghanistan and called his actions unforeseeable.

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