Indiana State Police are investigating a fatal shooting during an under-age dance party held Monday night at the Indiana State Fairgrounds. Two people were shot just after midnight during a confrontation at the "Ice Cold Christmas Jam," held inside the Blue Ribbon Pavilion. Shawn Campbell, 20, was pronounced dead at the scene. Police said an 18-year-old man was treated at Methodist Hospital for a gunshot wound to the shoulder. Investigators locked down the fairgrounds and held at least 200 partygoers for questioning well into the early morning hours.