Authorities said Trissa Donovan, 42, of Harrington and Mandy Kane, 37, of Addison were both walking on east side road.
It was just after 5:00 p.m. when they were struck from behind by a Dodge pickup driven by Kayla East, 23, of Addison.
Donovan and Kane were both rushed to the hospital, but Donovan could not be saved.
Kane is still being treated for non-life threatening injuries.
The sheriff's office said Kayla East had become distracted by her child and crossed the center line where she struck the two women.
She's now charged with driving to endanger and operating after suspension.