How a scrawny misfit turned into Florida's worst school shooter

MIAMI — He was chronically depressed, beguiled by firearms and violence, an oddball ostracized by peers and prone to angry outbursts. He experienced, in rapid succession, blows of the sort that can send a disturbed, isolated young man hurtling into a spiral of instability: Forced to move out of his lifelong home, spurned by a girlfriend, bounced from school to school, then suddenly losing his mother, his closest companion, to a fatal illness.