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 spent some time travelling, and visited Ethan during a break from travelling. When, during her visit, Ethan learned she wanted to return to Malawi, they decided to go their separate ways - in spite of their love for each other. Months later, Niamh returned to Emmerdale on a surprise visit. However, Ethan was out of the village at the time visiting friends and he couldn't be contacted. She left the village several days later, missing Ethan, who returned shortly afterwards.