The parents of a man shot to death by a Virginia officer have filed a lawsuit against the officer.

The Virginian-Pilot (http://bit.ly/1pmsLYS ) reports that Audrey and Glennis Latham filed a wrongful death lawsuit against Norfolk officer Michael Carlton Edington Jr. in Norfolk Circuit Court on Monday. The lawsuit comes 20 months after Edington shot 35-year-old David Latham.

The lawsuit seeks $9 million and accuses Edington of using excessive force and illegally shooting Latham.

Police have said Edington shot Latham in June 2014, after Latham threatened the officer with a knife. The Lathams' lawyer, John Cooper, says Latham didn't act aggressively during the event.

Latham had been suffering from mental health problems.

Edington's lawyer, Jeffrey Swartz, did not comment, saying he hadn't read the lawsuit.

Edington was charged with voluntary manslaughter in June. A trial is scheduled for September.

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Information from: The Virginian-Pilot, http://pilotonline.com