Sami Gayle, who portrayed Nicky Reagan on Blue Bloods, left the show after season 13. Her character, Nicky, went off to attend Columbia University, mirroring Gayle’s own pursuit of a degree at the same university. Gayle, aged 27, has taken on other projects, including a role in Andrew Lloyd Webber’s Bad Cinderella on Broadway. While there is speculation about a possible comeback for Nicky, it seems fans will have to wait until at least early 2024 for the next season of Blue Bloods due to delays caused by strikes in Hollywood.