This from Wikipedia:
“The Buffalo Bills have retired three numbers in franchise history: No. 12 for Jim Kelly, No. 34 for Thurman Thomas and No. 78 for Bruce Smith.”
“Number 32 had been withdrawn from circulation, but not retired, after O. J. Simpson. Former owner Ralph Wilson insisted on not reissuing the number, even after Simpson's highly publicized murder case and later robbery conviction. The number was placed back into circulation in 2019, currently worn by Senorise Perry.”[48]