Question: Why was Matthew reported missing? If there is no answer, please output "Insufficient information to provide an answer.". Movie title: I Spit On Your Grave Context: Manhattan short story writer Jennifer Hills (Camille Keaton) rents an isolated cottage in Kent, Connecticut on Park Hill Lane near the Housatonic River in the Litchfield County countryside to write her first novel. The arrival in town of the attractive and independent young woman attracts the attention of Johnny (Eron Taber), the gas station manager, and Stanley (Anthony Nichols) and Andy (Gunter Kleemann), two unemployed men who hang around the gas station. Jennifer has her groceries delivered by Matthew (Richard Pace), who is mildly mentally disabled. Jennifer is wearing tight clothing and Matthew peeps at her breasts. Matthew is friends with the other three men and reports back to them about the beautiful woman he met, claiming he saw her breasts. Stanley and Andy start cruising by the cottage in their boat and prowl around the house at night. One day, while Jennifer is relaxing in her canoe, they surprise her in their speedboat and tow her to shore. As she tries to escape, she is met by Johnny, while Matthew hides in bushes nearby. She realizes they planned her abduction so Matthew can lose his virginity. Jennifer fights back but is chased by the men through the forest, they then rip her bikini off and hold her to the ground. But Matthew refuses to have sex with her, so Johnny rapes her. They allow her to escape but track her down shortly afterward. Andy proceeds to anally rape her; after she crawls back to her house, they attack her again. Matthew finally rapes her after drinking alcohol, but he says that he can not reach orgasm with the other men watching him. The other men ridicule her book and rip up the manuscript, and Stanley sexually assaults her. She passes out; but, after the men leave, Johnny realizes she is a witness to their crimes and orders Matthew to stab her to death. Matthew cannot bring himself to do this, so he dabs the knife in the blood on her cheek and returns to the other men, claiming he has killed her. In the following days, a traumatized Jennifer pieces both herself and her...
A:
Jennifer killed Matthew.