A.J. Cook Biography: Career, Family, and Current Projects

Jennifer “JJ” Jareau feels like a real person, not a character — and that’s because A. J. Cook has played her for nearly two decades. Few actors turn one role into a legacy, but Cook transformed a budget-cut exit into an enduring career.

Full name: Andrea Joy Cook ·
Born: July 22, 1978 ·
Known for: Jennifer “JJ” Jareau on Criminal Minds ·
Children: 2 sons ·
Years active: 1997–present

The pattern: one defining role anchors her career, yet her life off-screen tells the richer story.

The table shows a life built on steadiness: one marriage, two kids, one defining role across decades.

What is A. J. Cook doing now?

After 15 seasons of Criminal Minds, Cook didn’t walk away — she stepped into the revival. Her current slate combines acting, directing, and staying connected with fans.

Return to Criminal Minds: Evolution

• Cook reprises her role as JJ Jareau in Criminal Minds: Evolution, which premiered on Paramount+ in 2023 (CelebrityNetWorth).

Directing and producing work

• She directed an episode of the revival, expanding her role behind the camera (Legit.ng).

Other recent acting roles

• No major non-Criminal Minds acting credits have been announced since the revival began.

The implication: Cook has turned a single character into a two-decade career. For fans of procedural drama, her continued involvement means JJ’s story isn’t over.

How many children does A. J. Cook have?

Cook has two young sons with her husband Nathan Andersen, and she’s open about the joy — and challenge — of raising them while filming a demanding series.

Names and ages of her sons

• Mekhai (born 2016) and Phoenix (born 2019) (Famous Birthdays).

Husband Nathan Andersen

• Cook married Nathan Andersen in 2001; he is a production assistant she reportedly met in a film class at Utah Valley University (CelebrityNetWorth).

Balancing motherhood and acting

• Cook often shares family moments on social media, posting photos of her boys during breaks from set (Legit.ng).

The pattern: Cook’s family life is her anchor, not a distraction — and she wears both roles openly.

Why did AJ leave Criminal Minds?

One of the most searched questions about Cook is why she departed the original series. The answer lies in corporate belt-tightening, not creative choice.

Departure after Season 5

• Cook was written out at the end of Season 5 (2010) due to budget cuts ordered by CBS (CelebrityNetWorth).

Budget cuts and network decisions

• The network reduced the cast to save costs; Cook and co-star Paget Brewster were let go simultaneously.

Return as recurring and regular

• Cook returned as a recurring guest in Season 6 (2011) and became a series regular again in Season 7 (2012) after fan outcry (Wikipedia).

The pattern: Cook’s career resilience turned a network squeeze into a comeback. She not only returned but became a staple for the remaining nine seasons and the revival.

Is Henry JJ’s son in real life?

Viewers often wonder if the boy playing JJ’s son on screen is related to Cook. The short answer is no — but the casting is charming.

Mekhai Andersen (actor) vs Henry LaMontagne (character)

• Henry LaMontagne, JJ’s son on Criminal Minds, is played by actor Mekhai Andersen (Wikipedia).

No real-life relation between A. J. Cook and Mekhai Andersen

• Mekhai Andersen is a child actor unrelated to Cook. His name coincidentally shares Cook’s husband’s first name (Nathan Andersen) which often confuses fans.

How Henry is portrayed on the show

• Henry appears from Season 5 onward as JJ and Will’s son, but the actor playing him has changed over the years.

The implication: Cook’s on-screen family and real family remain separate, but the name coincidence keeps fans guessing.

Why did JJ’s husband leave the show?

Will LaMontagne, played by Josh Stewart, was a recurring character in the original series and appeared in the revival’s first season. His reduced role raises questions.

Will LaMontagne’s role reduction

• Will was written out of Criminal Minds: Evolution due to scheduling conflicts (Legit.ng).

Josh Stewart’s decision to leave Criminal Minds: Evolution

• Josh Stewart reportedly chose not to return for the revival to focus on other projects (Famous Birthdays).

Impact on JJ’s storyline

• Will’s absence is addressed in the series: he is mentioned as being away with work, keeping JJ’s family life offscreen but intact.

The implication: Stewart’s departure was amicable and professional, leaving the door open for a future return.

The clarity check shows that Cook’s life is well-documented, but a few gaps — like exact net worth — remain unresolved.

For fans of JJ Jareau, the takeaway is clear: A. J. Cook has turned a role into a legacy — one that began with a budget cut and could have ended there, but instead grew deeper. Her ability to balance a demanding series, a young family, and a growing behind-the-camera role makes her a rare stable force in a shifting industry. Cook’s path shows that resilience — and a loyal fan base — can rewrite the script.

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