Sandra Sollie was last seen on May 23, 1994. She was 7 months pregnant.
Richard Ingraham investigated the case as a private investigator.
"At first I was just doing my job, and then after a few years it's like I became part of the family," he said. "It bothers me to no end. It's like I need closure on it too."
On the 20th anniversary of her disappearance, Macedon will dedicate a sign in honor of Sandra Sollie.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.