A Virginia transgender substitute teacher was arrested for allegedly plotting a chilling “murder spree” at a local school — and bragging online about having a disturbing hit list.

Hadyn Dollery, 19, was busted on school grounds Monday after posting threatening messages on Discord targeting John Champe High School in Stone Ridge, about 40 miles west of Washington, DC, according to the Loudoun County Sheriff’s Office and multiple outlets.

Police said a tip on the department’s Safe2Talk app exposed the suspect’s sinister online posts.

Hadyen Dollery, 19, was arrested Monday for allegedly plotting a chilling “murder spree” at a local school.…