Niamh O'Connor was the fiancée of Ethan Blake.
After dating for several years, Ethan and Niamh become engaged. However, their different views of the world lead to significant differences between them. Niamh spends some time travelling, and visits Ethan during a break from travelling. When, during her visit, Ethan learns she wants to return to Malawi, they decide to go their separate ways - in spite of their love for each other. Months later, Niamh returns to Emmerdale on a surprise visit. However, Ethan is out of the village at the time visiting friends and he can not be contacted. She leaves the village several days later, missing Ethan, who returns shortly afterwards.