Bynoe, 81, had been wandering the city for several days. Tanner found her more than six miles from where she had last been seen. She had changed clothes at some point.
"I know she suffers from Alzheimer's," Tanner said. "I could tell she was out of it and very confused, she said she had been walking around for a while."
Police say Bynoe is OK thanks to Tanner, although family members said she's spending the night in the hospital.
"I wish that if anything were to happen to my brother, someone would do the same thing for him," Tanner said.