FOND DU LAC, Wis. (AP) — Authorities say a woman found dead on the shores of an eastern Wisconsin lake likely died of exposure to frigid temperatures.

Fond du Lac County sheriff’s officials say 27-year-old Lindsey Klima was last seen leaving an ice shanty on Lake Winnebago approximately 100 yards (91 meters) from shore about 1:30 a.m. Monday. The Fond du Lac woman was reported missing about 4:40 p.m. Her body was discovered on shore about 6:30 p.m.

Authorities believe she fell at the shoreline after leaving the shanty.