Sophie Reeder left her father’s home in the middle of the night on May 20, 2017, and has not been seen since. A search of her computer revealed the 15-year-old had been in chatrooms with older men and on sugar daddy websites.
 
“Before Sophie went missing, there were some issues that could be warning signs,” says Sophie’s father, Patrick. “She got arrested shoplifting some alcohol.”
 

Patrick also says two months before his daughter disappeared, he told her he was going to send her to boarding school, and she got mad. “As a parent, I was looking for solutions, but in hindsight, what I think happened was I pushed her away even further,” he says.
 
In the video above, hear about an altercation the teen had that landed her in the hospital. And, Dr. Phil offers some insight.
 
The FBI says, on any given day, there are 500,000 predators online looking for their next young prey. On Wednesday’s episode, "To Catch an Online Child Predator," hear from a mom who says she caught her young daughter chatting and sending explicit videos to older men. Plus, meet Roo Powell, a mother of three and child advocate who is fighting online predators in an unconventional way. Check local listings to see where you can watch.
 
If you have any information about Sophie Reeder, please call 911 or 1-800-843-5678.

WATCH: 15-Year-Old Who Disappeared Four Years Ago Had Visited Adult Websites

TELL DR. PHIL YOUR STORY: Are you involved in a story making headlines?