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help.com. A manhunt is underway for the assassin who took out one of the most powerful

business leaders in this country.

United Healthcare CEO Brian Thompson shot in cold blood this morning.

And what police say was a targeted attack.

Now, it happened in one of the busiest places on earth, Midtown Manhattan.

This was more than 16 hours ago. The suspect caught on this very video

could now be anywhere. Police are scrambling to analyze everything from shell casings to a water

bottle, trying to figure out who he is, where he is, and why he did it. In a moment, you'll hear from our team of experts

and law enforcement analysts who are covering every angle of this story.

But first, the brand new timeline we've put together this evening.

Starting with this.

...