Not long after her arrival, Mercedes had set her sights on Russ Owen , even though he was in a relationship with Sophie Burton. She finally bedded him in September 2006, which was the same fateful night of The Dog In The Pond fire, set by Russ' brother, Sam Owen. Sophie died that night in the fire, waiting to see Russ. Mercedes and Russ became engaged. Mercedes was having a secret affair with Warren Fox, unable to keep to one man. The wedding day arrived, and was ful of drama. Russ was left stunned when Louise burst into the church claiming Mercedes had slept with her boyfriend Warren and needed the alibi to keep him out of jail. After lots of shouting, she denied everything and they got married.