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Preview: 'The Case of the Missing D.A.'

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A decade before the scandal of coach Jerry Sandusky dismantled the Penn State community, a local district attorney, Ray Gricar, was the first to investigate his case.  But a few years later, Gricar disappeared.  Was there a connection?  Lester Holt reports 'The Case of the Missing D.A.' on Friday, Dec. 16, at 10pm/9c.