LAGUNA NIGUEL, CA —A driver who ran over a U.S. Customs and Border Protection employee in Laguna Niguel will spend five years in federal prison, court records show.

Geoffrey Donald Rickner, 48 of Aliso Viejo, pleaded guilty to driving his Mercedes-Benz sedan into CBP security specialist Jose Gutierrez on March 3, 2016. Gutierrez was outside the Chet Holifield Federal Building, commonly known as the Ziggurat Building when he was struck. After slamming into the victim, the car continued through a metal garage door and crashed into a concrete wall. Gutierrez,walking in a well-marked crosswalk and wearing his federal employee identification card at the time, suffered severe head and leg injuries. He also suffered broken ribs and internal bleeding that resulted in a three-week hospitalization.

His injuries "continue to cause him pain and physical impairment," according to the U.S. Attorney's Office. By the time of the March 2016 attack, Rickner, a certified financial planner, had been involved in a years-long dispute with the IRS regarding his tax situation, according to the U.S. Attorney's Office. The prosecution's sentencing memorandum states: "Although the financial mess was entirely of his own making, the resulting stress made defendant frustrated and angry ...with the IRS and, more generally, the U.S. government."

According to a U.S. Attorney's Office statement, Rickner had gotten "involved in a 'tax denial' group, stopped paying taxes, and began incurring large civil penalties for non-payment of tax."

Rickner was behaving suspiciously in the hours before the collision, prosecutors said. Building security personnel detained him at one point, during which he made comments about owing money to the IRS, according to court documents. He had shown up at the Federal Building earlier that day to talk with someone at the IRS, but did not have an appointment and had been told to leave the premises.

Rickner pleaded guilty May 14 to one count of assault on a federal employee by use of a dangerous and deadly weapon and inflicting bodily injury and was sentenced to the 57-month term by U.S District Judge James V. Selna.