Heather (Played by the late Samantha Weinstein) is a mean girl, who along with her evil friends Chris Hargensen, Tina Blake and the Watson Twins, enjoyed bullying Carrie White. During their school's prom, during which Chris played a cruel prank on Carrie by dumping pig's blood on her after she was crowned Prom Queen, Heather was shown being one of many people laughing at her.
When Carrie began her vengeful rampage on the prom, Heather tried to run for the doors, but Carrie killed her by flinging into her the doors, causing her to smash/crack her skull against the glass.