TONIGHT’S MUST-SEE: “Law & Order,” 10 p.m., WDIV-TV, Local 4, NBC. The detached, just-the-facts world of “Law & Order” gets a solid jolt tonight. Murder leads to a probe of sports gambling. Suddenly, Det. Ed Green (Jesse Martin) is a suspect; when he arrived nine years ago, viewers were told he had a gambling problem. This is Martin’s final episode, but it also introduces his replacement. …

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