The Sheriff’s Department is asking for the public’s help in locating a critical missing person in the Yucca Valley area. Dorothy O’Brien age 89, 5 foot tall and weighing 121 pounds was last seen wearing a tan coat, tan slacks, and white shoes. O’Brien was last seen Thursday evening December 22, at about 5:00 pm in the 7000 block of Cholla Ave in Yucca Valley. Dorothy O’Brien has the beginning stages of Alzheimer’s disease. Contact Sheriffs Dispatch immediately at (760) 956-5001. Or call Deputy Herrera at 760-366-4175.