: Frank's grandson, Joe Hill, appears more frequently this season, often clashing with family protocol while working on joint task forces with the FBI.
: Following her adoption of a baby girl in the previous season, Detective Maria Baez balances the demands of motherhood with her high-stakes investigative work alongside Danny. Notable Episodes Blue Bloods - Season 13
: The season finale brings back several recurring characters and resolves key tensions from the DA race. Frank Reagan Tom Selleck NYPD Police Commissioner Danny Reagan Donnie Wahlberg NYPD Detective Erin Reagan Bridget Moynahan Assistant District Attorney Jamie Reagan Will Estes Field Intelligence Sergeant Henry Reagan Len Cariou Retired Police Commissioner Eddie Janko-Reagan Vanessa Ray NYPD Officer Maria Baez Marisa Ramirez NYPD Detective 13×13 Past History – Thoughts on Jamko : Frank's grandson, Joe Hill, appears more frequently