Helen Shyres is a friend of Sue Snell in Carrie.
She participated in the shower incident. She didn´t object to the decision of Sue Snell of bringing Carrie to the Prom implying that she behaved wrongly, but she also laughed, when Carrie was the victim of the evil prank. She dies electrocuted at the Black Prom.
Her mother dies later, too, when Carrie goes on a rampage in Chamberlaine.