Kieran was born in Manchester, the United Kingdom, the older brother of Cayley Hawthorne. While Kieran's family eventually moved to York he elected to remain in the city, working on earning a law degree at the University of Knightsbridge. With education proving expensive Kieran joined the British Army, serving in the Intelligence Corps before later ending up in the Special Reconnaissance Regiment. Kieran's time with the military helped teach him survival and surveillance skills. For over a year Kieran also dated Verity Knight, an officer with the Security Service, or MI5, the two even moving in together. His promising career came to an end when he was discharged, having only reached the rank of Lieutenant. A voluntary discharge, there were rumors Kieran had requested it to avoid insubordination charges being brought by his superior, Ziba Khoroushi.
Back in Manchester, Kieran was hired by the law firm of Sutcliff & Raynott, as while serving he'd also managed to earn a degree in law. Despite his youth, Kieran quickly impressed Malcolm Sutcliff in particular, who began to give him more responsibilities. At the same time, Cayley arrived in Manchester, attending Knightsbridge like he had. The time apart had caused the siblings to become a bit distant, but Kieran none the less did his best to make it clear to Cayley that he'd be there for her as needed.
In July of 2008, Kieran was in a car accident outside the city along with Heather Prescott, resulting in the pair's first meeting. With each blaming the other for the accident their relationship seemed doomed from the start. A month later, however, after having met with Heather again, Kieran suddenly discovered time was frozen. Not able to make sense of what was going on, Kieran found himself spending days in frozen time before eventually discovering Heather was also not frozen. The two investigated the scene of their crash and discovered traces of a magical ritual (one performed by Joanne Gallagher on the Winterborne Armband), but still were unable to understand what exactly had transpired. Eventually, the pair learned to unfreeze time by holding hands and learned they could both unfreeze it and freeze it at will. Kieran remained cautious about abusing the newfound power but did concede they should try to learn more about it.
Sometime after the incident, Kieran and Heather met at the FashionZeit office, where they learned more about their powers whilst simultaneously thwarting a cyber attack from Senfashional. It was after a dinner at Celeste's that the two started to truly act as a team, Kieran wanting to help his ex-girlfriend Verity and Interpol agent Larissa Penbrook investigate Felicia Silvermane. The pair helped rescue Verity and Larissa from Silvermane, also taking down Jeremy Atkinson in the process and discovering the existence of both Type-7 and the Type-7 Chip. Kieran's quasi-friendship with Heather saw him ask her to be his date with the Friends in Need Charity Ball. As his relationship with Heather deepened, Kieran also found his initial objections to how to behave with time frozen becoming laxer. Despite the risks, when Rebecca Ang bullied Cayley at Trafalgar Centre, Kieran happily stopped time to deal with her and her friends, the exact kind of thing he'd previously objected to.
The Friends in Need Ball brought radical changes to Kieran's life. First, he discovered new secrets about his own abilities, including that he could freeze Heather while time was frozen. Second, he finally revealed Verity that Ziba had threatened to damage his own unit with trumped up charges if he didn't sleep with her, explaining his departure from the military. Third, Kieran fought alongside Verity, Larissa and new arrival Georgina MacKenzie to repel an attack by the Crown Breakers, anti-royal terrorists. Finally, Elizabeth Moncrieff, who'd fought alongside him, came onto him, the two becoming lovers by the end of the evening.
- Current Age: 28
- Height: 5'10"
- Weight: 168 lbs
- Hair Color: Dark Brunette
- Eye Color: Blue
- Hypnosis Rating: 5
- Current Place of Residence: Manchester, UK
- Sexual Preference: Women
- Favorite Food: Steak
- Other Notes: Brunette Fetish
- 1999 Titan Silver Metallic BMW M3 E36
- Cayley Hawthorne, Younger Sister
- Dave Messick, also Roommate
- Ben Cheeseman, also Roommate
- Karen Barker, also Co-Worker
- Tom Dewey, also Co-Worker
- Heather Prescott
- Larissa Penbrook
- Manchester Chronicles: The Longest Birthday
- Manchester Chronicles: Underhanded Dealings
- Manchester Chronicles: My Fair Ladies
- Manchester Chronicles: Stone Cold Payback
- Manchester Chronicles: Shop til you Stop
- Manchester Chronicles: Having a Ball
- Manchester Chronicles: After the Ball
- Manchester Chronicles: The Taming of a Few
- Kieran is physically based on actor Colin O'Donoghue.