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There’s little research on girls who’ve formed pacts to kill.

Yet, in those pacts we're aware of, we see some common traits and behaviors.

These traits and behaviors might prove useful for prediction and prevention.

Recently, two teenage girls in Florida were accused of plotting to murder a classmate. Isabelle Valdez, 15, and Lois Lippert, 14, students at Lake Brantley High School in Altamonte Springs, had told a friend, who’d then reported the imminent attack. Police searched them and found a knife in Valdez’s backpack. She admitted that she’d planned to use it on a boy. In an apology to her parents, Valdez wrote, “I've known there's been something wrong with me since I was little. I deserve what's coming for me as I am also disgusting, cruel, and useless.”

Her reasoning was bizarre: She thought the boy resembled Adam Lanza, the suicidal mass murderer of 20 kids and six adults in 2012 at the Sandy Hook Elementary School. Killing this boy, Valdez thought, would resurrect Lanza and create a “blood bond” between the three of them. Lippert allegedly assisted by supplying items, she sharpened the knife, and drew graphic sketches for Valdez. After their arrest, they laughed together in the police car and complained about the snitch who’d blocked their plan. Lippert reportedly said, “This is such a bonding experience.”

This incident recalls the 2014 case in which 12-year-olds Morgan Geyser and Anissa Weier attempted to sacrifice their friend, Payton Leutner, to appease the tentacled Internet boogeyman meme, Slender Man. Payton survived the stabbing—barely. The girls were to be tried as adults. One took a plea, but both were determined to be not guilty by reason........

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