Charlie in Hereditary

In this memorable horror film from Ari Aster, poor young Charlie (Milly Shapiro) dies in an extremely shocking and awful manner.
After accidentally eating peanuts at a party, Charlie goes into anaphylactic shock. Her brother Peter (Alex Wolff) drives her to the hospital, speeding frantically. Struggling to breathe as her throat closes up, she sticks her head out of the car window to get more air. Unfortunately, Peter swerves to avoid a deer in the road and instead hits a telephone pole.
Charlie is abruptly, and shockingly, decapitated.