Three years ago Linda Woo, then 40, woke her two children, wrapped them in blankets, and placed them inside a Subaru Outback owned by a man who had recently broken off a six-year-affair with her. Also in the car had been placed a lit barbecue grill -- which Woo had bought along with a carbon monoxide meter -- after she'd researched how to commit suicide by breathing charcoal fumes. When the trio were found a short time later, Olive Woo Murphy, age 3, petite with dark wavy hair, was dead. Linda