Evening News Online, 03.22.12

      |Thursday: The Sanford, Fla. police chief steps down amid calls for justice in the case of the neighborhood watch captain who killed 17-year-old Trayvon Martin; Also, the Los Angeles coroner releases the official cause of the death of Whitney Houston; Plus, new data shows fewer women are choosing to get married; And, a remarkable teacher finds a way to turn a gang member in her classroom into a graduating high school senior.

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