Helen Shyres is a friend of Sue Snell in Carrie (Novel).

She participated in the shower incident. She didn´t object to the decision of Sue bringing Carrie to the Prom implying that they behaved wrongly, but Sue suspected that she knew something was going to happen to Carrie, and was withholding information. However, she burst into tears when Carrie was the victim of the evil prank.

It is unknown if she survived The Black Prom. However her mother dies later, when Carrie goes on a rampage in Chamberlaine.