Artemis and Actaeon
Artemis was once bathing in a vale on Mount Cithaeron, when the Theban hunter Actaeon stumbled across her. Enraged, Artemis turned him into a stag and, not knowing their own owner, Actaeon’s own dogs killed him.
Artemis and Adonis
In some versions of the story of Adonis, who was a late addition to Greek mythology during the Hellenistic period, Artemis sent a wild boar to kill Adonis as punishment for his hubristic boast that he was a better hunter than she.
In other versions, Artemis killed Adonis for revenge. In later myths, Adonis had been related as a favorite of Aphrodite, and Aphrodite was responsible for the death of Hippolytus, who had been a favorite of Artemis. Therefore, Artemis killed Adonis to avenge Hippolytus’s death.
Orion was a hunting companion of the goddess Artemis. In some versions of his story he was killed by Artemis, while in others he was killed by a scorpion sent by Gaia. In some versions, Orion tried to seduce Opis, one of her followers, and she killed him. In a version by Aratus, Orion took hold of Artemis’ robe and she killed him in self-defense.
In yet another version, Apollo sent the scorpion. According to Hyginus Artemis once loved Orion (in spite of the late source, this version appears to be a rare remnant of her as the pre-Olympian goddess, who took consorts, as Eos did), but was tricked into killing him by her brother Apollo, who was “protective” of his sister’s maidenhood.