This is the second episode in which Wentworth Miller has played Kings County ADA Isaiah Holmes, the first being Murdered at a Bad Address (2019). He previously played Manhattan Homicide Detective Nate Kendall in Unstable (2009).
The mentioned "Tau Omega Fraternity" is fictional. The fictional fraternity is mentioned in several episodes: S5.E12, S14.E6, S14.E20, S17.E8, S22.E6.