Can Scully Really Sing?

He grew his trademark flattop for his role in the 1997 movie, Dead Men Can't Dance. After growing it his agent persuaded him to update his headshots and keep the haircut. He also plays Scully's twin brother Earl in the episode Cinco de Mayo. ... All of Scully's opera singing is Miller's own.

Is Scully really a twin?

Earl Scully is the identical twin brother of Detective Norm Scully.

Why is Scully not in Brooklyn 99?

In the show's storyline, the pandemic was playing out as well, and Hitchcock used that as the segue to retire. Instead of heading to work every day, he moved to Brazil. If you watch the show, you know that Hitchcock is really close to his partner of 30 years, Norm Scully (Joel McKinnon Miller).