Watch full version: br The Last House on the Left Part 1br br A group of young adults set up tent near the abandoned summer camp where a series of gruesome murders are said to have taken place back in 1980. The perpetrator was a grieving mother, driven insane by the drowning of her child, Jason, whom she believed was neglected by the camp counselors. As legend has it, the last survivor of the attacks beheaded the woman.