(AP) — Colorado authorities are investigating what caused a two-vehicle collision that killed a Nebraska woman.

The Colorado State Patrol says the crash happened on U.S. 285 near Pine Junction on Thursday.

A car driven by 51-year-old Michelle Whyte crossed the center line of the highway and collided with a 2009 Kia Optima with four people inside. Whyte sustained life-threatening injuries.

In the Kia, 73-year-old Charlene Page of Broken Bow was killed. Her husband, 76-year-old Paul Page of Broken Bow, and her daughter, 54-year-old Rhonda Rodriguez of Thornton, Colo., both suffered life-threatening injuries. Sixty-year-old Francisco Rodriguez of Thornton was also hurt.

The current condition of everyone who was hurt wasn’t immediately available Sunday.

Investigators are checking whether texting, excessive speed and prescription drug use contributed to the crash.