Police are still searching for a missing Bell County woman who was last seen Sunday morning.

Kathryn Heck's family is worried their mother is outside and alone as the temperatures get colder.

58-year-old Heck's daughter-in-law says she was not acting like herself the last few days before she went missing, and now her family is worried she is in danger.

Across Bell County, dozens of people are searching for Heck around the clock.

"We've been going door to door today handing out flyers, walking the rail road tracks, climbing the mountains, just looking everywhere," said Patricia Heck.

Patricia Heck says her mother-in-law has high blood pressure and thinks her recent abnormal behavior could be signs of a stroke.

Heck was spotted walking up and down railroad tracks in the Noe Town area of Middlesboro and near the Yellow Creek Cemetery.

Family members say they will keep searching until she is found.

Kathryn Heck is 5'4", 180 pounds, with blue eyes. She was last seen wearing blue jeans and blue-green shirt with white tennis shoes. Anyone with information should call police.