Authorities investigating the year-old disappearance of a 70-year-old northeast Kansas woman are seeking the public’s help.

The Topeka Capital-Journal reports that Joan Rebar was last on Sept. 26, 2015, at the Veterans of Foreign Wars post in Meriden. About 3.5 hours after Rebar was last seen, her phone transmitted its last ping, indicating it was south of Meriden. Her banking activity also ceased.

Jackson County Sheriff Tim Morse describes the case as “disturbing” and “eerie.” He says that because Rebar’s disappearance was under “very questionable circumstances,” it is being investigated as a homicide.

A multi-jurisdictional task force has been involved in the search. The task force interviewed more than 100 people and searches were carried out on foot, horseback and ATV. Sonar and drone technology also was used.