The movie begins in the idyllic town of Haddonfield, IL, in 1963. Michael Myers is a mere child when he murders his sister Judith on Halloween night. Her boyfriend had just left the house after fooling around with Judith, and she's seated (topless, naturally) and brushing her hair when Michael comes with a kitchen knife and stabs her to death. It's the first of many sequences that we see through Michael's eyes during the film.
Michael's parents find him looking nearly catatonic — still holding the bloodied murder weapon — outside their home.