Authorities are offering a $5,000 reward in a Boise City cold case, the Oklahoma State Bureau of Investigation reported Friday. On June 12, 2013, Charles Neiman, 77, and his wife stopped at Loaf-'n-Jug convenience store, 323 Main St. in Boise City, to get gas. While Nieman was outside his vehicle, a Hispanic man walked up to him and demanded for his wallet, OSBI reported. Nieman, who was hard of hearing, turned to his wife to ask what the man said, and the man shot Nieman in the head. The shooter ran away. Neiman was taken to a local hospital where he died, OSBI reported. Nieman would have celebrated his 55th wedding anniversary this month. He is survived by three children and six grandchildren. The shooter has not been identified, OSBI reported. OSBI is offering the $5,000 reward for information leading to the arrest and conviction of the man who killed Nieman. Anyone with information is asked to call OSBI at (800) 522-8017.