Blue Bloods has been a staple of network television for over a decade. The show follows the Reagan family across generations of law enforcement. Each week focuses on a case, a family conflict, or a moral decision that ties back to duty. It has stayed true to its format without chasing trends.
Viewers return for the familiar patterns. They know what they are going to get. But even a show built on tradition leaves some things unanswered. Questions build up over time. Some involve characters who vanish without a word. Others involve plotlines that seem important but fade away.
Fans have held onto these gaps. They wonder about the father of Erin’s daughter. They ask why Linda was written off without a final scene. They notice that Jack Reagan is mentioned less and less. The show drops hints but does not always follow through.
These questions have become part of how people watch Blue Bloods. The family may sit down together every week, but not everything makes it to the table. This list looks at ten questions the show has never answered. These are not nitpicks, but things that still make people pause years after the episode aired.
Blue Bloods: 10 questions that were never answered
1) What really happened to Joe Reagan?

Joe Reagan died before the show began, and his death was blamed on a line-of-duty ambush. Later, it was revealed that he had been investigating the corrupt Blue Templar. That twist opened a deeper mystery that the show never revisited again.
We never learned how far Joe got in his investigation or who exactly had him killed. The story gave weight to the Reagan legacy and explained Frank’s stern leadership style. But the details stayed buried. For a character who shaped the family’s arc from the beginning, Joe’s death still feels unfinished and strangely avoided by the writers.
2) Why did Jackie Curatola disappear without closure?

Jackie was Danny’s original partner and stayed on the job through three seasons. Her chemistry with Danny balanced out his impulsive behavior and kept the cases grounded. One episode said she took a leave of absence, but the show never followed up.
She never returned, and her name was barely mentioned after that. The actress had real-life health issues, but in the show, Jackie vanished. That silence makes her absence one of the most noticeable gaps in the show. Her exit still feels abrupt and unresolved years after she left the precinct.
3) Why did Linda Reagan’s death happen offscreen?

Linda Reagan’s death was revealed between seasons with a single mention. She died in a helicopter crash. No one saw it, and no investigation happened. That kind of exit felt hollow for someone so central to the Reagan family dinners and Danny’s story.
The show used her death to deepen Danny’s grief and harden his personality. But by skipping the actual event, the show avoided any emotional payoff. Linda supported Danny through countless cases, and her absence changed the tone of his arc. The quiet way she was written off made the character’s importance feel strangely ignored and rushed.
4) Who is Nicky’s father, and why does he never appear?

Nicky Reagan is Erin’s daughter and has been part of the story from day one. But the show never showed her father. His name is unknown, and he has never appeared on screen. Erin only once said she felt lonelier during her marriage than afterward.
That brief comment is the only clue to a whole part of her life. For a show built on family history, this gap feels jarring. Nicky’s father could have added real tension or depth to Erin’s arc. Instead, his complete absence leaves her story with a strange blank space that never gets acknowledged.
5) Why hasn’t Jamie Reagan moved up the NYPD ranks?

Jamie Reagan scored first on the Sergeant’s exam. He showed strong leadership and earned praise from both officers and family. He took command when needed and proved himself in high-risk situations. Still, he has not moved past Sergeant after all these years.
The show hints that Jamie likes working in the field, but never gives a clear answer. For someone as steady and capable as he is, the lack of progress stands out. Viewers expected more. His career stalls while others grow. That decision leaves him stuck in place, and it makes his arc feel strangely repetitive and limited.
6) What happened to Danny’s son Jack?

Jack Reagan was part of the show from the early seasons. He left for college in season nine. Since then, the character has vanished without much explanation. His brother Sean still appears, but Jack is barely mentioned in recent episodes.
The show never updated fans on Jack's whereabouts or what he's been up to. For a family that always gathers around the dinner table, his absence feels strange. Viewers noticed how the bond between Danny and Jack disappeared without a word, and that lack of closure still lingers.
7) Will Erin Reagan ever run for District Attorney?

Erin has always been portrayed as tough and sharp. The idea of her running for District Attorney has come up many times across the seasons. But every time the show moves toward that story, it backs off before anything big happens.
She has the ambition and the qualifications. The office would shift her role and raise new conflicts, but the show never commits. Her career stalls, and her story stays on repeat. That lack of progression makes her arc feel stuck. For a character so central to the justice side of things, she has never had her breakout moment.
8) Why is Mary Reagan never shown or explained?

Mary Reagan was Frank’s wife and the family matriarch. She has never appeared on screen. The show never reveals how she died or what her relationship with Frank was like. Viewers only see a photo on the wall and hear vague mentions.
Frank refers to her with respect, but the lack of detail leaves questions. Every other Reagan has a backstory or a defining moment. Mary remains a mystery. The family talks about tradition and memory, but never opens up about the one person who shaped their roots. That missing piece keeps her role distant and incomplete.
9) Why isn’t Henry Reagan’s time as Commissioner explored?

Henry Reagan was the Police Commissioner before Frank. He often gives advice based on his own experiences. But the show never tells us what those experiences really were. No flashbacks, no old cases, no defining decisions from his time in office.
He is used as a mentor figure, but without the depth. The writers never explore what kind of Commissioner he really was. Viewers know he is respected, but not why. For someone who shaped the family’s legacy, that missing history stands out. The show misses a real chance to connect Frank’s choices to his father’s past leadership.
10) Will Joe Hill ever be fully accepted into the family?

Joe Hill was revealed as the son of Joe Reagan. He joined the NYPD and quickly earned his place in the field. But his connection to the family still feels uneven. He appears in some episodes but does not attend every Sunday dinner.
The Reagans always stress unity and loyalty. But with Joe, the tone stays careful. His storyline added emotion and brought back memories of the past. Still, he feels like a guest, not a full member of the family. That distance keeps his character from reaching full potential. Viewers notice the gap, and it continues to feel unresolved.
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