"Please everyone share this," his daughter wrote in a post that has since been made private on Facebook. "My dad is looking for a daughter that was adopted while he was very ill and was unable to gain custody in 1978."
The post went viral, and media groups also shared the story.
"If she doesn't see it, I'll probably go to my grave regretting it," Miller told WAVE. "Wondering if she's dead or alive. If somebody is taking care of her the right way."
Miller stopped wondering Sunday, when they reconnected.