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    Tragedies mark Dallas police chief's career

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Tragedies mark Dallas police chief's career

The Dallas officer ambush isn't the first time Police Chief David Brown has been faced with adversity. CNN's Randi Kaye reports.

Tragedies mark Dallas police chief's career

The Dallas officer ambush isn't the first time Police Chief David Brown has been faced with adversity. CNN's Randi Kaye reports.