The surprise return of Jackie Curatola (Jennifer Esposito) in Blue Bloods season 14 suggests that she may have a more prominent role in the storyline. Jackie was Danny Reagan's former partner and left the show in 2012 due to stress. However, Esposito also left the show for medical reasons as she was diagnosed with Celiac disease. After her departure, Jackie returned in season 13 as a police chief, working with Danny to catch a criminal. If Jackie were to return again in season 14, it would make for an exciting premiere.