There are several different stories about Orion in Greek mythology. He is often depicted as a handsome and skilled hunter who was beloved by the gods. In one story, Orion was killed by the scorpion sent by the goddess Artemis after Orion boasted that he would kill every animal on Earth.
While the constellation itself is named after the mythological figure, it's important to note that it doesn't depict him as a hunter. The constellation Orion is actually depicted as a man holding a shield and club. This is why it's often referred to as the "Hunter" despite not actually appearing as one in the sky.