text: Tape of Bigley Decapitation Posted on Web BAGHDAD, Iraq - A videotape of the beheading of British hostage Kenneth Bigley appeared Sunday on an Islamist Web site, showing the civil engineer pleading that he wanted "to live a simple life" moments before he was decapitated.    The nearly five-minute tape appeared two days after Bigley's family said it had proof that the 62-year-old civil engineer from Liverpool was dead...