Tammy and Mike say their 17-year-old daughter, Alyssa, was a happy, healthy cheerleader, involved in her school and family until eight months ago. The parents say since then, the teen’s life has taken a downward spiral of using drugs and alcohol and becoming violent.

TELL DR. PHIL YOUR STORY: Have a story Dr. Phil won't believe?
 
However, the parents say they never expected Alyssa to do what she did next: try to hire two people to kill them.
 

“I want to make sure we are acknowledging the full dark side of this,” Dr. Phil tells Tammy and Mike. Watch more in the video above.

WATCH: What Parents Say Was Their First Reaction After Learning Daughter Tried to Hire People To Kill Them
 
Why did the teen want them dead? And, will she face decades in prison? Check here to see where you can watch Thursday’s episode.