The day Sally Wiley replaced the blue star on her flag with a gold star was the darkest day of her life.
Her son, Sean Diamond, was killed by a roadside bomb in Iraq on Feb. 15, 2009.
"It was the saddest, worst thing that ever happened in my life. There's no way to describe what it's like losing a child," Wiley said. "It's gut-wrenching. You can't believe it, and you can't understand it."
The Wiley's are one of a few military families in the Valley to have lost a child during wartime.
"We're a very small group here," Wiley …