At least 12 people are dead as the result of a shooting at the Washington Navy Yard. Security has been tightened in the nation's capital.
The motive is not yet known. Dr. Drew and his guests will discuss why people commit acts such as this. They'll address who is likely to plan and carry out such a thing. And they'll get into the reaction of those who were there; the heroic response from police and those who never dreamed they'd be confronted by a gunman at work.