An Eastern Iowa teenager gravely wounded over the weekend while shooting off fireworks with friends has become what authorities believe is the first person killed by the consumer explosives in the state since the Iowa Legislature legalized them last year. Bremer County sheriff’s deputies said Coltin Carolus, 18, was injured Saturday while discharging fireworks in Waverly. Medics with Waverly Ambulance Service transported him to Waverly Hospital, but he was then transferred to Covenant Medical Center in Waterloo, where he was put on life support, according to the Sheriff’s Office. He was removed from life support at 5:30 p.m. Sunday, and his organs were donated, according to report. “Since it became legal last year, this is the first time we’ve heard of a fireworks fatality itself,” Iowa Fire Marshal Dan Wood said Monday.