BLOOMFIELD, N.M. — Authorities say a Denton County family was killed when their vehicle collided head-on with another while they were traveling in New Mexico.New Mexico State Police say the crash occurred Friday around 9 p.m. on U.S. 550, about 20 miles south of Bloomfield. According to investigators, 24-year-old Brian Lee became fatigued while driving northbound and crossed the center line. They say his Ford truck crashed into a van heading southbound. All four occupants in the van died immediately upon impact. Authorities have identified them as 47-year-old Michael Miller, 48-year-old Leann Miller and their two children, 12-year-old Zoey Miller and 7-year-old Miles Miller, all of Argyle. Police say Michael Miller was the only person using a seat belt. Lee was hospitalized with non-life-threatening injuries. State police say the investigation remains ongoing.