'Slender Man' Mother Breaks Silence, Says Her Daughter Is Mentally Ill and Adult Charges Are 'BS'

"These are children," says mom of teen charged as an adult with stabbing friend 19 times.

The mother of one of the girls charged with brutally stabbing a 12-year-old friend to appease the fictional “Slender Man” character says her daughter is mentally ill and should not be charged as an adult.

“I was shocked to learn 12-year-olds can be charged as adults,” said Angie Geyser, 36, the mom of Morgan, now 14. Morgan and Anissa Weier were 12 when both were charged with luring classmate Payton Leutner into a wooded area and stabbing her 19 times, authorities said.

Read: Judge Enters Not Guilty Pleas For 13-Year-Old Girls Accused of Stabbing Classmate to Impress 'Slender Man'

Leutner, though left to die, ultimately recovered from her wounds.

Morgan’s mother spoke publicly for the first time about her daughter when she spoke with the Milwaukee Journal-Sentinel last week.

“You can’t hold somebody responsible for the rest of their life for something they did when they were 12,” Angie Geyser told the paper.

Morgan has been diagnosed with early onset schizophrenia since she’s been in custody, her mother said. Her father also suffers from the same mental illness, but Geyser said the disease doesn’t usually manifest itself until early adulthood.

Both girls have pleaded not guilty and the Geysers say the cases should be moved to juvenile court. Each is being held in lieu of $500,000 bail.

“Some of the comments on stories say ‘Adult crime, adult crime.’ That’s BS. These are children,” the mother said.

Read: Slender Man Stabbing Mugshots Released, As Victim Walks in Hospital

The two Waukesha, Wisconsin, girls generated international news stories following their arrest. They were trying to reach a northern state forest, where they believed Slender Man lived in a mansion.

The fictional internet boogeyman is often portrayed as a purveyor of children and an all-around creepy devil.

The two girls plotted for months to kill Leutner, police said, hoping that would please Slender Man and they might be allowed to live with him.

The girls’ attorneys have appealed a judge’s ruling to try them for attempted homicide as adults.

Watch: 12-Year-Old Steals Car From Elderly Man After Getting Out Of Vehicle