A woman suffering from Alzheimer's is safe after she was found by an alert citizen who saw her lying in the street days after she wandered away from home.

Dean Tanner said he didn't initially realize the woman was the same person police had spent days searching for. His brother has special needs, so it has always been in his nature to look out for folks who may seem like they need help, and Friday morning his nature saved Evelyn Bynoe.

"She looked out of it," Tanner told WFXT. "I honestly thought it was an overdose, that's why I approached her, I didn't touch her just said, 'Are you OK?' She said, 'Yeah.'"

Tanner continued on to his office, but couldn't stop thinking about the woman. He then turned on his computer and saw a tweet from the Boston Police Department asking the public to help find a woman suffering from Alzheimer's.

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.