BLOOMINGTON, Ill. — The FBI is offering up to a $10,000 reward for information on the final hours of an Illinois State University graduate student who disappeared in August and was later found dead in a river.Jelani Day, a 25-year-old Illinois State University graduate student and Danville native, was reported missing on Aug. 25, a day after he was last seen in Bloomington, Illinois. His body was found in the Illinois River near Peru, 60 miles north of the ISU campus, on Sept. 4.Authorities later determined he died …