A 20-year-old Forsyth County man was killed Tuesday night when his car slid under an 18-wheeler on Ga. 400 in north Forsyth, authorities said.

Forsyth County Sheriff’s Capt. Frank Huggins identified the man as Kyle Hayes Palazzo of Wallace Tatum Road.

Huggins said Palazzo was traveling north about 8:15 p.m. when his 2000 Honda Civic struck the back of a tractor-trailer stopped at the Settendown Road crossing.

The fatality was the third in less than two weeks and fourth of the year in Forsyth County, with all four deaths having come since May 4.

The driver of the truck, 58-year-old Randall Howard Griffin of Roanoke, Ala., likely will not be charged in connection with Tuesday night's wreck, Huggins said. The 18-wheeler is owned by Wal-Mart.

He said Griffin told authorities he felt something hit the truck, which was stopped in the right lane for the traffic light. Motorists at the intersection alerted him to the Honda underneath the truck.

“He got out and found out the car ran under it all the way up to the back of the driver’s seat,” Huggins said.

Authorities have not determined why the Civic did not stop before the collision, though they said drug and alcohol do not appear to be factors.

The road was reopened about 9:50 p.m.

Tuesday's death was the third fatality of the month. Head-on collisions June 3 and 10 each claimed one life.

In the June 10 wreck, a 62-year-old Alpharetta man was killed when his pickup collided with a fuel tanker at Porter Lane and Hwy. 53 in northeastern Forsyth.

On June 3, a 39-year-old man died when his vehicle crossed the centerline and struck a large box truck on Atlanta Highway (Hwy. 9) in south Forsyth.

The first fatal wreck of the year happened on May 4. Also a head-on collision, it claimed the life of a 72-year-old woman on Keith Bridge Road in northeastern Forsyth.

An 18-year-old driver faces one count each of second-degree vehicular homicide and failure to maintain in connection with that wreck.

No charges were filed in the other fatal collisions.