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Richard Christian Dillard, 55, killed himself outside the home in Irving, Texas.
Rep. Van Duyne heard gunshots, went outside and found the body before calling 911.
Investigators and the FBI will look into the motive and how Dillard got into the gated community.
An ex-staffer died by suicide outside Republican congresswoman Beth Van Duyne s home in Irving, Texas, on Wednesday afternoon.
Richard Christian Dillard, 55, killed himself outside the home of the first-term Texas representative while she was inside with others who all heard the gunshots, the Independent reported.
They went outside and found the body before Rep. Van Duyne called 911. Police responded to the call at 3.45pm, Robert Reeves, Public Information Officer at Irving Police Department, told NBC News.