MOUNT PLEASANT (CBSDFW.COM) –  A couple and a one-year-old boy were killed and a three-year-old boy was injured after rear-ending a freightliner tractor-trailer that was pulled over along the side of eastbound Interstate 30 Saturday just west of Texarkana.

Rockwall residents Leah Compton Eason, 30, and 1-year-old Luke Eason were pronounced dead at the scene. James Eason, 30, died at Titus Regional Medical Center in Mount Pleasant.

A 3-year-old boy was taken to Children’s Medical Center and is in good condition, a spokesman said. Public safety officials have not released his name.

A spokesman said the tractor-trailer was stopped “for traffic reasons.” The Easons were driving a 2009 Hyundai. James Eason was a fifth grade teacher at BJ Smith Elementary in the Mesquite ISD. Leah Eason had been an assistant principal at Florence Black Elementary for one year.

The district posted information about the tragedy on its Facebook page, calling it “a very sad day for the MISD family,” and added that the “family has had a positive influence on many young lives.”