Authorities issued the advisory for 29-year-old Tami Michelle Olson after her car was found in the parking lot at Weston Bend State Park with a suicide note around midnight Wednesday.
Her boyfriend told police she left her cell phone and other personal property at her home in Omaha.
Olson has a tattoo on her right shin and was last seen wearing a gray tank top and black pants.
Anyone with information on her whereabouts should call 911 or the Missouri State Highway Patrol at (816) 622-0800.
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