On Monday, the Brady Center to Prevent Gun Violence and the widow of a slain Plymouth Township police officer filed a lawsuit against the West Norriton gun store that sold to a straw purchaser. The suit is part of the Brady Center’s campaign against “bad apple” gun dealers.

“The suit alleges gross negligence by In Site Firearms for selling six guns in a three-month period to a man they should have identified as a straw purchaser. One of those guns was used to kill Officer Brad Fox in September 2012,” writes The Inquirer‘s Jessica Parks.

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“According to the suit, In Site ignored several red flags about Michael Henry, including that he was a drug addict who had already purchased several of the same type of gun. Henry always paid in cash and transferred the guns to Andrew Thomas, a convicted felon barred from having firearms, in the gun store’s parking lot.”

Thomas shot Officer Fox while fleeing from a fatal traffic accident. He then turned the gun on himself. Henry pleaded guilty to the straw purchases he made and is serving a minimum sentence of twenty years.

Henry bought nine guns for Thomas, the suit says, and eight still have not been found. These missing firearms are what motivated Lynsay Fox to file the suit.

“I can’t bear to think about what those guns are being used for and the other families that may be suffering like mine,” she said.