PHOENIX (AP) — The mother of an Arizona police officer killed in a collision with an intoxicated wrong-way driver in the United States without permission is demanding to know why the man wasn't deported after being convicted in a Colorado criminal case.

Mary Ann Mendoza wrote President Barack Obama, demanding that he explain why Raul Silva Corona was allowed to remain in the United States and eventually kill her son.

Corona and Mesa police Sgt. Brandon Mendoza died May 12 on a Phoenix-area freeway ramp when the off-duty officer's car collided head-on with Corona's vehicle.

Court records show that Corona had pleaded guilty to a criminal conspiracy charge in Adams County, Colorado, and that other charges were dismissed.

The White House did not respond immediately Thursday to a request for comment.