Answering her doorbell just after 10 p.m. Friday, Mary Jo Cooney looked through her peephole in San Francisco's Mission Terrace neighborhood and saw nothing.
She didn't realize her late-night visitor was too short to see. It was 5-year-old Oscar Limon, spattered with his parents' blood and clutching a Nintendo video game, trying to find someone to help him and his younger sister.
After Oscar rang a second doorbell on Badger Street, neighbors made a terrible discovery. In an extended-cab pickup truck parked around the corner on Still Street, the boy's father and mother had been shot dead.
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