Judge Dredd - Sector 190
Judge DeLillo was a very experienced senior Judge and a veteran of many Hotdog Runs and missions into the Cursed Earth. It seems that his time in the radioactive wasteland eroded his morals and sense of judgement. He was aggressive and uncaring toward the cadets in his charge, to the point of endangerment.
DeLillo was killed in a revenge attack before the SJS could conduct a full investigation into reports of his lapsed judgement and his cadets' suspiciously low mortality and pass rate.
DeLillo was shot and disintegrated by an alien weapon wielded by a vengeful mutant.