A 16-year-old girl who believed that human beings are actually robots admitted Monday to killing a 7-year-old girl as the child played in a field in England, according to a new report.

The teen, who was not identified, copped to manslaughter charges in the Jan. 9 death of Katie Rough in York.

Leeds Crown Court said the young murderer suffered severe mental problems and believed people “weren’t human and were robots,” according to the BBC.

Prosecutors said the girl had been self-harming since Christmas 2015 and suffered from delusions that people “may not be human and may be controlled by a higher and hostile force.”

She was taken out of school in 2016 because of her mental health problems.

The teen told a witness the day of killing that Katie was dead. The little girl was found with cuts to her neck and torso and was smothered before she slashed. She later died at a hospital.

Katie’s parents called the loss of their daughter “absolute devastation.”

“We found her at the same time as a police officer found her. I cradled her. I saw her injuries and I knew she was gone. It’s impossible to describe,” Alison Rough told the BBC. “It was just the darkest. I never knew that I could feel something so terrible. There’s no words for how we felt. It was just absolute devastation.”