ARGYLE, Texas -

The son of a North Texas woman is grappling with the deaths of his mother, stepfather and two half-siblings when a pickup truck slammed head-on into their vacation van in New Mexico.

The Friday night crash in northwestern New Mexico killed 48-year-old LeAnn Miller, 47-year-old Michael Miller and their children, 12-year-old Zoey and 7-year-old Miles. The pickup truck driver suffered non-life-threatening injuries.

Cory Dixon says he was at the family's Argyle home when he talked with his mother by phone for about 10 minutes shortly after 8 p.m. Friday. Eight minutes later, the rest of the family was dead.

Dixon, who's 24, told the Denton Record-Chronicle that he was thankful that he talked with his mother one last time before she died.