One person died Saturday afternoon in a one-vehicle crash east of Murdo.

The name of the person involved is not being released pending notification of family members.

Preliminary crash information indicates that a 2003 Chevrolet Avalanche pickup truck was eastbound on Interstate 90 when it went off the roadway to the left. The vehicle eventually went across both eastbound lanes, into the south ditch and rolled.

The 74-year-old male driver was not wearing a seat belt and was thrown from the vehicle. He was pronounced dead at the scene.

Three people died Saturday afternoon in a two-vehicle crash southeast of Wolsey.

Names of the three people are not being released pending notification of family members.

Preliminary crash information indicates that a 2002 Chevy Tahoe was westbound on U.S. Highway 14 when it crossed the center line and collided head-on with an eastbound 2016 Toyota Rav4.

All three people involved were pronounced dead at the scene. They were the 40-year-old male driver of the Tahoe and the 55-year-old female driver and 78-year-old female passenger of the Rav4. All three were wearing seat belts.

Traffic was detoured at the crash site for about four hours.

South Dakota’s Highway Patrol is investigating the crashes. All information released so far is only preliminary.