Kate Callahan

Very little is currently known about Kate's early years. She has a background in criminal psychology and worked as an agent for the FBI's Sex Crimes Unit for eight years, with her specialty being undercover operations. Her work has allowed her to establish a prior friendship with the BAU team. It was also mentioned that she once worked with SSA Andi Swann and her Domestic Trafficking Task Force.

In her personal life, she is in a committed, stable marriage with a man named Chris. She went through a big loss during the 9/11 terrorist attacks, as her sister Liz and brother-in-law Joe were among the thousands of victims. The two of them were working at the Pentagon when American Airlines Flight 77 was flown into it by Al-Qaeda terrorists. Since then, she has become the guardian for their infant daughter, Meg, who she has since raised for the past thirteen years. All of these happenings have shaped her patriotic attitude. According to Erica Messer, Kate is "smart, charming, and wise for her years". She also holds a passion for making the world a safer place and is a "nurturing figure" in her personal and professional lives. Kate also is willing to "go to great lengths to get her job done". Because it takes her months to capture a criminal, whereas the BAU captures their unsubs weekly, she finds herself having to adapt to that schedule. She is extremely skilled at manipulating criminals, who usually fall for her beauty and giving her leeway in her cases. Seductive.