Murder and arson charges have been formally filed against a Rock Valley man in connection with the death of his Grandfather in October. Nineteen-year-old Santos Rodriguez, Jr. is scheduled to be arraigned on December 11. Investigators say Rodriguez admitted to stabbing his 84-year-old Grandfather, Luis Luevanos on October 29. Officials say Rodriguez, Jr. then intentionally set a fire at the home. The body of Leuvanos was discovered by authorities after responding to a report of a fire inside the residence. Rodriguez was arrested in early November in Utah and was extradited to Iowa. He is scheduled to be arraigned next Monday in Sioux County District Court.