A beloved teacher was attacked and killed by a mysterious animal in North Carolina, and officials are still trying to figure out what happened.

On Friday, paramedics who responded to a 911 call for an animal attack found Brenda Hamilton, 77, suffering from serious injuries along a road in Beaufort County Monday.

The Beaufort County Sheriff’s Office said in astatement that Hamilton had died.

Officials originally said a DNA test eliminated “any wild animals indigenous to the area.” Later, they said test results did find  K9 DNA at the scene that could match anything from a wolf or coyote to a domestic dog.

Sheriff’s investigators are currently testing dogs in the area.