A Tremont woman died Sunday after bystanders helped her from an Otis pond.

Deborah Wedge, 67, was on the water on Beech Hill Pond off Salisbury Cove Road about 4:21 p.m. when she likely suffered an unknown “medical event,” according to the Hancock County Sheriff’s Office.

Bystanders rescued her from the water and performed CPR until first responders arrived, the sheriff’s office said early Monday morning.

But Wedge died at the scene.

Her death remains under investigation.

Otis is north of Ellsworth.