A Duluth woman was killed and her 4-year-old son was seriously injured when their car strayed into the path of a semitrailer truck and collided head-on, authorities said.

The wreck occurred about 2:40 p.m. Wednesday near the intersection of Normanna and Arnold roads in Gnesen Township, roughly 15 miles north of Duluth, according to the St. Louis County Sheriff’s Office.

The Sheriff’s Office identified the car’s driver as Natalie A. Alvar, 33, of Duluth, and the boy as Race J. Klassen.

The boy was in critical condition Wednesday night in a Duluth hospital, the Sheriff’s Office said.

According to the Sheriff’s Office, deputies and first responders came to the scene and saw the boy in the mangled car “still belted in,” a statement from the agency read.

Alvar, apparently was not wearing her seat belt, was thrown from the vehicle after it hit the timber-hauling semi on Normanna Road. She pronounced dead at the scene. No injuries were reported for the truck driver.