Alexandra was a serving girl in a tavern when Nicholas and LaCroix came to the place in which she worked. Soon enough, a sort of relationship was formed between her and Nick, but he couldn't fight the urge, bit her and sucked out most of her blood, then left her for dead. Before her burial, LaCroix noticed that there was still life in her and brought her over, unbeknown to Nicholas. This may have been because LaCroix noticed a sort of fear in his apprentice for what he did and wanted her to torment him in future years.