Police seek help in cold case Christi Jo Nichols was last seen alive on Dec. 10, 1987, and the Gothenburg Police Department is still seeking help with this “cold case.” The Dawson County Sheriff’s Office, the Nebraska State Patrol and GPD all have investigated her disappearance for periods of time throughout the years. GPD police chief Randy Olson,PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today!