TMDb/Blue Bloods TV Why Blue Bloods' Jack Reagan disappeared: Actor Tony Terraciano prioritized medical school over acting, leading to his limited appearances in later seasons. April 25, 2026 AceShowbiz - Blue Bloods fans often notice how the Reagan family regularly gathers around the dinner table, showcasing many of its members throughout the series. However, one character who appeared less frequently than expected was Jack Reagan, portrayed by Tony Terraciano.