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the new calls for tougher regulations. > the mysterery at sea. what happened to three experienced american sailors who disappeared without a trace off the coast of mexico almost two weeks ago? a new treatment for melanoma brings promising results. rates of recurrence and death down dramatically and ten years after the boston marathon bombing, how their injuries forged a bond that has withstood the test of time, inspiring america. >> announcer: this is nbc "nightly news" with lester holt good evening and welcome. an akron, ohio grand jury charging decision in the police shooti...

at the 25-year-old black motorist last june. the state attorney general saying the officers thought walker was reaching for a gun during a chase. will it ignite new protests? breaking news in kansas city. a homeowner charged with two felony counts after he shot a black teenager who rang his doorbell mistakenly. the prosecutor now saying there was a racial component in the case. growing outrage by u.s. allies after the leak by a national guardsman of those top secret documents, and what they reveal about washington's china concerns. a string of massive and worrying chemical expl...

Tonight, after days of protests demanding justice the kansas city homeowner who family say shot 16-year-old ralph yarl twice for ringing the wrong doorbell faces criminal charges. >> i can assure you that the criminal justice system is working and will continue to work. as with any serious case, we approached this one in an objective, impartial manner. >> you have the times where he's like why, i did nothing wrong, why. >> reporter: dr. faith spoonmore says her nephew was trying to pick up his younger twin brothers from a friend's house thursday night when he mistakenly went to the wrong home....