McKinley says she decided five years ago to cut ties with her father, Cory.

TELL DR. PHIL YOUR STORY: Explosive Family Drama?

A decade ago, Cory pleaded guilty to two charges of sexual battery of a minor. He served 150 days in jail but insists he did not commit the crime.

WATCH: Father Of 18-Year-Old Adamantly Denies Her Allegations Of Abuse

McKinley, who found out about the charges in 2015, says she decided then never to speak to Cory again.

Why does the 18-year-old say she wants to confront her father now?

Part one of this two-part Dr. Phil airs Monday. Check here to find out where you can watch.

TELL DR. PHIL YOUR STORY: At odds with a family member?