(Fox News) Immigration officers have arrested a Guatemalan national who mowed down and killed an FBI agent and a fire marshal on a Maryland highway last year.

Roberto Garza Palacios was accused of being unlawfully present in the U.S. after overstaying a work visa that expired in 2009, Fox 5 DC reported Friday. He was arrested Thursday in Gaithersburg, Md., where he was living.

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