Mrs. Diaz is from the United States and had two sons, Oscar and Andrés. Despite stories of a an unknown outbreak, she was attending Oscar's wedding to Jessica Stowe at the Rosarito Beach Hotel in Baja California, Mexico.
Mrs. Diaz, alongside her family, is seen at the reception of her son's wedding at the Rosarito Beach Hotel's ballroom, and is seen to be enjoying the celebrations, watching the brides dance with her father Charles. However, Charles suffers a heart attack due to his concern over the outbreak, and reanimates, biting Jessica. As panic ensues in the ballroom, the Hotel Manager, Elena Reyes in an effort to contain the situation locks the doors of the ballroom, leaving Mrs. Diaz trapped inside the ballroom with the remaining wedding guests. As many guests survived this ordeal, her current status is unknown. However, as she is not with her sons and the remaining survivors as shown in "Pablo & Jessica", she is presumed to have died in the ballroom.
- "Do Not Disturb" (Flashback)