Advertisement Narrator

After hours of waiting, detectives finally reveal to Angie what her daughter has done in the woods. Could you believe what you were hearing?

When we come back, what these parents would learn about their own daughters, an extraordinarily rare diagnosis. And for parents watching across this country tonight, what are you to do when children are drawn in by someone or something that you never knew existed?

When we come back, what these parents would learn about their own daughters, an extraordinarily rare diagnosis. And for parents watching across this country tonight, what are you to do when children are drawn in by someone or something that you never knew existed?

For more than three years now, those two girls who confessed to brutally stabbing their 12-year-old friend have been locked up. Their mothers still hope their daughters will one day come home. Christy Weier's daughter, Anissa, sits behind these walls at the Washington County Juvenile Jail. And Christy shows us one of Anissa's paintings done just a few months before that horror in the woods.

For more than three years now, those two girls who confessed to brutally stabbing their 12-year-old friend have been locked up. Their mothers still hope their daughters will one day come home. Christy Weier's daughter, Anissa, sits behind these walls at the Washington County Juvenile Jail. And Christy shows us one of Anissa's paintings done just a few months before that horror in the woods.

She tells us she had no idea her daughter had fallen so completely under Slender Man's spell. They did it to impress Slender.

She tells us she had no idea her daughter had fallen so completely under Slender Man's spell. They did it to impress Slender.

And it turns out that Peyton, who crawled out of those woods alive, had even told her mom that Morgan thought that Slender Man was real. Did it give you pause?

And it turns out that Peyton, who crawled out of those woods alive, had even told her mom that Morgan thought that Slender Man was real. Did it give you pause?

But their fantasy would give way to reality. And Morgan and Anissa now face charges of attempted first-degree intentional homicide.

But their fantasy would give way to reality. And Morgan and Anissa now face charges of attempted first-degree intentional homicide.

Anthony Cotton is Morgan's attorney. He says he knew the moment he met her that he was not dealing with a typical 12-year-old.

Anthony Cotton is Morgan's attorney. He says he knew the moment he met her that he was not dealing with a typical 12-year-old.

The girls are formally charged as adults, each facing the possibility of up to 65 years in prison.

The girls are formally charged as adults, each facing the possibility of up to 65 years in prison.

Morgan and Denise's families launch a legal fight to get their daughter's cases moved from adult court to juvenile court. Children's court is the right place for this case. It would mean more resources to help treat their mental health, but it also meant that each girl could be freed as soon as their 18th birthday, something prosecutors would immediately fight.

Morgan and Denise's families launch a legal fight to get their daughter's cases moved from adult court to juvenile court. Children's court is the right place for this case. It would mean more resources to help treat their mental health, but it also meant that each girl could be freed as soon as their 18th birthday, something prosecutors would immediately fight.

After the brutal attack, investigators searching Morgan's room would find disturbing evidence of a deteriorating young mind, dismembered Barbies, drawings of Slender Man with children, and pages and pages of messages that she had written to herself. We pour through those drawings with Morgan's mother and find one of the darkest messages.

After the brutal attack, investigators searching Morgan's room would find disturbing evidence of a deteriorating young mind, dismembered Barbies, drawings of Slender Man with children, and pages and pages of messages that she had written to herself. We pour through those drawings with Morgan's mother and find one of the darkest messages.

Morgan also writes, help me escape my mind. This one makes me sad.