MINNEAPOLIS (AP) _ A Chicago man accused of fatally shooting another man in the head on a Minnesota highway after an apparent road-rage incident has been indicted on a first-degree murder charge.

Thirty-three-year-old Jamal Smith had already been charged with second-degree murder in connection with the July death of 56-year-old Jay Boughton.

In Minnesota, the count of premeditated first-degree murder must be charged by a grand jury; Smith will face a mandatory life sentence if convicted.

Smith's attorney was out of the office Friday and did not immediately return an email message seeking comment.