Isabel Mercedes Celis RESOLVED Isabel, circa 2012 Missing Since 04/20/2012 Missing From Tucson, Arizona Classification Endangered Missing Age 5 years old Height and Weight - Distinguishing Characteristics - Details of Disappearance Isabel disappeared from Tucson, Arizona on April 20, 2012. In March 2017, her remains were found in a remote desert area of Pima County, Arizona. Her death is under investigation. Investigating Agency - Source Information KTAR News . .