![](http://i2.cdn.cnn.com/cnnnext/dam/assets/170620185053-philando-castile-dash-cam-super-tease.jpg)
Philando Castile shooting: Dashcam Video
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What's most shocking is how fast it happened. It took just 40 seconds for an ordinary traffic stop to turn deadly -- from a police officer saying, "Hello, sir," to him firing seven shots at Philando Castile.