Johnny Grier, NFL's first Black referee, dies at 74 – Football Zebras
List of people from Illinois - Wikipedia
NFL's first black NFL referee Johnny Grier dead at 74
Officiating (Sports) - The New York Times
Johnny Grier, first Black referee in the NFL, dies at 74 - The Washington Post
Notable Deaths of 2022: Sports - The New York Times
UDC: “We Are Black History” Johnny Grier
List of people from Illinois - Wikipedia
The New York Times in Print for Saturday, March 12, 2022 - The New York Times