To date, in Indiana, there have been a total of TWELVE reported COVID-19 deaths in people 19 and under (explore the dataset for yourself). The dataset does not reveal how many, if any, of those deaths were in people 18 or 19 years old. This equates to 0.1% of COVID-19 deaths in Indiana.
Due to Indiana State Department of Health reporting with this dataset, we do not know what co-morbidities, if any, that they had. Nor do we know their vaccination status.