Is it really Courtney who dies in pretty little liars and not Allison?

In "Pretty Little Liars," it is ultimately revealed that Courtney DiLaurentis, Alison's twin sister, is the one who dies. Throughout the series, Alison is believed to be dead, but it is later uncovered that she had been alive and in hiding. The confusion arises from the twins' identities and the manipulations surrounding them, but Alison does survive the series, while Courtney's fate is sealed.