Sioux City police said officers were called to Interstate 29 south for a person laying in the road at the Hamilton Boulevard exit at 3:26 a.m.
Police said 42-year-old Sarah Zirbel of Sioux City had been hit by a semi-tractor pulling a livestock trailer. Zirbel was critically injured and taken to Mercy Medical Center where she died.
Investigators said it appears Zirbel was standing on the roadway in the right lane of I-29 near the Hamilton Exit.
Police said the incident remains under investigation and no other information is being released at this time.
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