RAPID CITY, S.D. — Officials say Highway Patrol troopers found the body of a woman in a vehicle they eventually stopped on the interstate in western South Dakota after a pursuit that reached speeds of more than 100 miles per hour.

Authorities say the driver, a 30-year-old California man, was arrested after he tried running from the vehicle after it came to a stop along I-90 in Rapid City Monday.

Attorney General Marty Jackley said Tuesday his office is conducting an investigation into the woman’s death. A trooper tried stopping the speeding vehicle on I-90 near Spearfish about noon on New Year’s Day. The pursuit continued for nearly 50 miles and reached speeds of 118 mph before officers used stop spikes to disable the vehicle’s tires.

Officers found the woman’s body after arresting the man.

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