Jakelin Caal Death in Custody Reporting Act of 2021 This bill requires an investigation and reports for each death of an alien in Department of Homeland Security or Department of Health and Human Services custody. Within 24 hours of such a death, the relevant department shall provide to Congress a publicly available report containing (1) the name, gender, race, ethnicity, and age of the deceased; (2) the date, time, and location of the death; and (3) the circumstances surrounding the death. The relevant department shall conduct an investigation within 30 days of the death of an alien in its custody, including an analysis of (1) the root cause of the death, and (2) any policy or systemic changes that could reduce the possibility of such a death in the future. The results of such an investigation shall be reported to Congress and made publicly available on the internet.