Cariou played Frank's father Henry Reagan, a retired police commissioner and former Marine who, like Danny, is very vocal about his political beliefs. In addition to the regular cast, the season also featured actors who received the "also starring" billing, appearing in almost every episode of the season. Jennifer Esposito portrayed Jackie Curatola, an NYPD detective at the precinct and Danny's partner. Nicholas Turturro portrayed Sergeant Anthony Renzulli, Jamie's partner and mentor, who had been a partner of Joe Reagan. Several recurring characters appeared in the first season. Amy Carlson appeared as Linda Reagan, Danny's wife and mother of two children Jack and Sean. Sami Gayle portrayed Erin's teenage daughter Nicole "Nikki" Reagan-Boyle (Marlene Lawston played this role in the pilot episode). Abigail Hawk portrayed Abigail Baker, Frank's primary aide. Brothers Andrew and Tony Terraciano portray Sean and Jack Reagan, Danny and Linda's sons. Gregory Jbara acted as Garrett Moore, the NYPD's Deputy Commissioner of Public Information. Robert Clohessy played Sgt. Sidney Gormley, the immediate supervisor of Danny and the other detectives at the precinct. Actress Dylan Moore appeared in the first eight episodes as Jamie's short-lasting fiancée Sydney Davenport. Bruce Altman portrayed Mayor Frank Russo, Frank's superior. Andrea Roth appeared in four episodes as Kelly Davidson, a television news reporter who dated Frank. Yvonna Kopacz Wright portrayed Ava Hotchkiss, a detective at the precinct and Danny's temporary partner. Noelle Beck appeared in three episodes as Frank's Deputy Press Secretary Sue Connors. Nick Sandow recurred in four episodes as Lieutenant Alex Bello, an officer at Internal Affairs. Michael T. Weiss portrayed Sonny Malevsky, a detective who had worked with Joe Reagan before his murder. Colleen Clinton appeared as Agent Anderson, an FBI agent who attempts to recruit Jamie for her investigation into the Blue Templar. Bobby Cannavale appeared in three episodes as Charles Rosselini, Erin's boss who becomes romantically involved with her. Robert John Burke portrayed Jyle Hogan in three episodes. Main cast Tom Selleck as Police Commissioner Francis "Frank" Reagan Donnie Wahlberg as Detective 1st Grade Daniel "Danny" Reagan Bridget Moynahan as ADA Erin Reagan Will Estes as Officer Jamison "Jamie" Reagan Len Cariou as Henry Reagan Recurring cast Jennifer Esposito as Detective 1st Grade Jackie Curatola Abigail Hawk as Detective 1st Grade Abigail Baker Robert Clohessy as Sergeant Sidney "Sid" Gormley Abigail Hawk as Detective 1st Grade Abigail Baker Gregory Jbara as Deputy Commissioner of Public Information Garrett