In November 2015, a 15-year-old Ohio teen went outside to walk her dog and disappeared. A massive search was carried out and after 23 days, she was found.

WATCH: Teen Recalls The Day The FBI Found Her At The Home Of A Man She Says She Met Online

Private investigator Robert Slattery helped track the whereabouts of the missing teen who traveled 700 miles across state lines from her home in Ohio to the Missouri home of a 41-year-old man she says she met online.

In the video above, Slattery shares how he and his partner used social media to locate the missing teen.

“Without today’s technology, she may have never been located,” Slattery says.

This episode of Dr. Phil airs Friday. Watch more here.