Criminal Minds Season 12 spoilers dropped quite a big bombshell, confirming that the show will feature the return of Reid’s mother, Diana, in the next season. Is she coming back with a mystery?

Diana is coming back after eight long years. As per reports, actress Jane Lynch is reprising her role as Reid’s mother in Criminal Minds season 12. We can expect to see her for the first time in episode 11 of the forthcoming installment of the show.  Now the million dollar question: why is she coming back?

Spilling the beans about her return, show executive producer Erica Messer said:

“We’re really excited. It’s a fun Reid story and she’s really excited to come back and reprise her role. She’s been a busy lady and we’re still here, so we’re happy to be able to offer that opportunity for her to come back.”

It was in 2008 when we last saw Dr. Spencer Reid’s (Matthew Gray Gubler) mother. Since then she never made an appearance. While the viewers are quite aware of her whereabouts, she’s only been a background character.

Although the story continued in the absence of Diana, it never failed to mention and give updates on her. She never went out of the plot. For example, during Criminal Minds‘ ninth season, Reid received a postcard from his mom about her supervised trip to the Grand Canyon.

In fact, in the previous season, Reid took a leave of absence to visit Diana at Bennington Sanitarium after she took a turn for the worst. Later on, the viewers came to know, during a cat-and-mouse hostage situation, his mother was detected with dementia. What makes the story more interesting was her change of behavior as she couldn’t recognize her own son right away.

Then again, her condition seemed to be improving by the finale, when Reid was planning a trip with her to Paris, according to TV Guide.

Packed with so many twist and turns, Diana’s character is no less than a mystery now. If spoilers are to be believed she will appear in two episodes of Criminal Minds season 12 for a “heavy Reid story.” The fans are now hopeful that her return will unveil many mysteries.

What are they exactly? For that, you need to wait until Criminal Minds season 12 returns Wednesday, September 28 on CBS.