However, there is more than one version of Achilles versus Penthesilea. In several of these, it was Achilles who died, not she. (See: Heinrich von Kleist, Penthesilea (Drama) and Robert Graves, The Greek Myths Vol II, page 313.)
Queen of the Amazons who, in the post-Homeric legends, fought for Troy after Hector's death. She was slain by Achilles, who at that same moment was moved by her courage and beauty.