Natalie Lynn Rupnow is the 15-year-old female student who carried out the mass shooting at Abundant Life Christian School in Madison, Wisc. A teacher and student were killed. Six others were wounded, two with life-threatening injuries.

A purported "sneak peek" of her manifesto was posted on her Discord account, where she discussed a desire to kill all males in a rant inspired by fringe extremist online culture. A screenshot was posted on X by a person who was her Discord friend. The account also posted a mirror selfie photo of Rupnow.

Rupnow has a long, disturbing online history of being obsessed with school shooters and death. She used the moniker "crossixir" online.

Rupnow's Cash App account is a picture of the Columbine shooters. She had an account on "Watch People Die" where she commented on the videos. Her Spotify playlists featured themes of s—icide and killings.