Investigators say 42-year-old Alexia McAvaney of Wilmington was trying to cross Kirkwood Highway (Route 2) east of Duncan Road when she was struck by a 2008 Toyota Highlander SUV.
It happened at 6:22 p.m. Sunday.
Medics rushed McAvaney to Christiana Hospital in critical condition. She was pronounced dead a short time later.
Police said the 18-year-old driver of the striking SUV did stop at the scene and that alcohol did not appear to be a factor in the collision.
Investigators also said McAvaney was wearing dark clothing and was not in a crosswalk when she was struck.
So far no charges have been filed.
The incident remains under investigation.