William Spengler raised no alarms in prison for 17 years and for more than a decade afterward. Well-spoken, well-behaved and intelligent, his demeanor was praised by four straight parole boards that nevertheless denied him parole, worried that bludgeoning his 92-year-old grandmother with a hammer showed a violent streak that could explode again. After his sentence was up in 1996, he stayed out of trouble until 2010, police said Friday. That's when Spengler went to a sporting goods store...
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