LEON, Kan. (AP) -- The Butler County sheriff's office say freezing overnight temperatures might have contributed to the death of a woman who was missing overnight.

The sheriff's office says the body of 30-year-old Beth Ann Noffsinger of El Dorado was found in a field near Leon early Monday.

Authorities tell KAKE-TV (http://bit.ly/Vvbbvk ) that Noffsinger and her 52-year-old fiance were near the field about 1 a.m. when the woman became disoriented, jumped out of the car and ran away.

Butler and Greenwood county deputies, Kansas Highway Patrol air support and other agencies searched for the woman before finding her body about 6:45 a.m.

An autopsy has been requested but investigators say there are no signs of trauma or foul play. Authorities say Noffsinger was not properly dressed for temperatures that dropped well below freezing.