|Behind the scenes|
|Appearances||The Reichenbach Fall|
|Portrayed by||Katherine Parkinson|
- "There's all sorts of gossip in the press about you. Sooner or later, you're going to need someone on your side. Someone to set the record straight."
- ―Kitty Riley, "The Reichenbach Fall"
Kitty Riley is an investigative journalist appearing in the final episode of Season Two: "The Reichenbach Fall".
Riley tries to get her first big scoop by interviewing Sherlock Holmes. She approaches him to test his prowess at first, and then she leaves her card with him; however, Sherlock leaves her with three words: "You repel me."
Later on, she is tricked by Jim Moriarty, who was pretending to be an actor that was hired by Sherlock to play a criminal mastermind. She fully believes his act and publishes her first big scoop using the information he provided.
Ambitious, callous and narcissistic, Kitty was easily swayed by Jim Moriarty's pseudonym of Richard Brooke and wanted only to be famous as Sherlock Holmes's companion. She also seemed to be rather cold and arrogant, selfish enough to try and manipulate Sherlock Holmes for her own gains, but the detective was far too intelligent to be controlled by her arrogance.
- While her name is spelled 'Riley' in the show and newspapers, it is spelled 'Reilly' in the casebook, and the newspapers featured in the casebook.