Timothy Hoffman says his daughter, Cynthia, had a slight disability and that she was so eager to have friends. He says she told him that her classmate Denali Brehmer was her best friend, and the two would hang out now and again. Timothy says Denali was a fast talker and made him feel uncomfortable at times, but 19-year-old Cynthia assured him they were best friends – and he says he trusted his daughter’s judgment.

TELL DR. PHIL YOUR STORY: Are you involved in a story making headlines?
 
Denali, reportedly one of the people Cynthia trusted most in the world, is now accused of plotting Cynthia’s murder. It’s alleged that Denali lured Cynthia into the Alaskan wilderness under the guise of playing a game with some friends, but that Cynthia was instead bound with duct tape, shot, and thrown in a river.

WATCH: ‘I Knew Something Happened Wrong In My Heart,’ Says Alaskan Dad Whose Teen Daughter Was Killed
 

In an exclusive interview with Dr. Phil airing Friday, Timothy shares the alleged motive for the teens to kill his daughter – a plot that involves molestation, a killing on video, and a promise of $9 million.
 
On Friday, Timothy reveals how he learned his daughter had been killed, and he shares what he would tell her today. Check here to see where you can watch.