The chief of a Massachusetts police department that’s been gripped by allegations of sexual misconduct and murder told “Dateline” that she felt “obligated” to share details unearthed by her investigators in the harrowing case of Sandra Birchmore, who authorities say endured years of abuse in a police youth program before her death at the hands of a former detective. In her first media interview, Stoughton Police Chief Donna McNamara offered an apology and said she hopes

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