Teachers in at least three states have died after bouts with the coronavirus since the dawn of the new school year, and a teachers’ union leader worries that the return to in-person classes will have a deadly impact across the U.S. if proper precautions aren’t taken. AshLee DeMarinis was just 34 when she died Sunday after three weeks in the hospital. … A third-grade teacher died Monday in South Carolina, and two other educators died recently in Mississippi.