Kathryn works as a bartender in London. She is sweet, smart and witty, offering support to Liam after the mob murder of Ted Pryce. It turns out she and Liam know each other, because she used to date Robert. In spite of this, Kathryn has developed feelings for Liam and they start seeing each other. Once Robert returns, they decide to break things off, with Kathryn telling Liam to stop fighting for her. They also decide to come clean to Robert, but Liam has a hard time finding the proper moment and gets increasingly angry with his brother as Kathryn starts seeing Robert again.