Gravois Mills resident Nikki R. Shaffer, 24, was killed in one-vehicle wreck early Sunday morning in Morgan County.
Her passenger, Springfield resident Travis W. Oakley, 23, was seriously injured.
The Missouri Highway Patrol said Shaffer was westbound on Bass Point Road, 0.3 miles east of Missouri 5 at about 4:03 a.m. when her vehicle ran off the side of the road and hit several trees.
Shaffer was not wearing a seat belt. Oakley, who was taken to Lake Regional Hospital in Osage Beach, was wearing one.