His death came a day after the death of another inmate, Byron Dale Bird, who was serving a sentence at the high-security penitentiary on the prison grounds.
The 65-year-old Bird was taken to a local hospital on Aug. 27 after testing positive for the virus and was admitted to an intensive care unit. He died at the hospital on Sunday. Bird was serving a 74-year prison sentence after being convicted of sexual abuse of a minor, witness tampering, failing to register as a sex offender and other charges.
Witnesses to the federal executions are required to undergo security screening at the high-security penitentiary, where Bird was housed. The witnesses are required to wear masks, and their temperatures are taken before they are permitted on the prison grounds.
The spiritual advisers for two of the men who were executed in July and the family of one of the men's victims had fought unsuccessfully to delay their executions over coronavirus concerns.
The federal prison system has struggled to combat the coronavirus pandemic behind bars, where social distancing is nearly impossible. As of Tuesday, 13,477 inmates had tested positive for COVID-19 at facilities across the U.S.; 11,623 had recovered. Officials said 120 inmates have died since late March.