Before opening fire on an aerobics class, George Sodini wrote about feeling lonely and rejected — yet those very characteristics put him in the company of other mass killers whose isolation helped create a murderous cocktail. Sodini's deadly rampage at a suburban Pittsburgh health club shares threads with other massacres analyzed by psychiatrists and legal experts, who say the line ...

For an hour, the Asian man cowered amid the chaos of what had been his adult English class. Blood soaked through his jeans where a bullet had fractured the bones of his lower right leg. More blood flowed into his eye from a bullet wound ...