Kristy Simmons is the wife of SSA Matthew Simmons and was a recurring character on Criminal Minds: Beyond Borders. She reappeared in Seasons Thirteen, Fourteen, and Fifteen following Matt's transfer to the BAU.
Little is revealed about Kristy's personal history, other than she has been married to SSA Matthew Simmons for ten years and has four children with him; David, Jake, twin daughters, Chloe and Lily, and baby Rose. This led to jokes about Matt being a "breeder". Kristy understands the demands of Matt's job with the FBI but still wishes her husband was home with the family more often.
She is mentioned as Matt Simmons is known for being a breeder.
Criminal Minds: Beyond Borders
Kristy appeared in five episodes of the spin-off, particularly episodes focusing on her husband or the personal lives of the IRT.
Kristy appears first at the beginning of the episode when she needs to get to work. However, Matt convinces her to stay home and enjoy her time with him. She is then briefly seen on the phone with Matt when he is on-duty. Kristy is then seen last at the end of the episode when Matt gets home, eventually being joined by their 4 kids.
Kristy appears in this episode in which she and her colleagues are taken hostage by The Horsemen. However, Matt and the BAU come to the rescue; Kristy helps get in contact with them with the smartphone she bought for Simmons earlier. She also stops Matt from beating one of the Horsemen to death.
Kristy appears in this episode as she and Matthew deal with their son, David, being suspended from school after physically lashing out at a friend over a comment regarding cop shows. It is revealed that Kristy has been going for therapy due to the trauma from the hostage incident.
She reveals that she is pregnant with their fifth child.
Kristy appears in the beginning of this episode at her baby shower.
Kristy is placed on bed rest so Matt stays home to watch the kids.
Kristy appears in this episode. She is unhappy with her husband for the purchase of the crib he bought as it was bright red. She also goes into labor and gives birth to Rosemary Simmons.