Heather C. Timmins, 48, and Atticus Timmins, 10, killed when vehicle strikes parked truck on shoulder of Interstate 15 in Farmington, Utah

“For an unknown reason, the driver of the Infiniti swerved to the right, crossing lane four, and entered the shoulder where the IMT unit was sitting,” the news release says. “The driver side of the Infiniti struck the rear of the IMT truck at a high rate of speed.”