It was a Friday. Myriam Marquez was driving home from her job as a public defender for the Skagit County Public Defender's Office in Mt. Vernon, Washington, when she came to a four-way stop: "And all of the sudden, I didn't know where I was, and I didn't know whether to turn right, left or go straight," she vividly remembers. Hysterical, she picked up her cellphone to dial her daughter and explain the predicament. She only lived a half mile away. Once she composed herself, she realized where she was. "But at that moment," says Marquez, 68, of Seattle, "I knew I had Alzheimer's disease."