Investigators probing wreckage after deadly medical helicopter crash

In the last decade, 100 people have been killed in more than 80 medical helicopter accidents.
1:08 | 04/27/18

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Transcript for Investigators probing wreckage after deadly medical helicopter crash
Reporter: The funeral for corporal Cole is next week. And the medevac chopper going down in the woods. Here's David Kerley, on the often risky emergency missions. Reporter: Tonight, investigators are in this wooded area of north Wisconsin, examining the wreckage that left a medevac crew of three dead. It was like a bunch of a lot of rotors hitting trees you know that chopping sound and then it was quiet. Reporter: Having just dropped off a patient, the chopper went down just before 11:00 at night. In the past decade, 83 medevac helicopters have been involved in accidents, killing a total of 100 people. Medevac flights are often at night sometimes in bad weather, which is why the NTSB wants companies to do a better job of assessing risk. The irony is entirely is the very people that go out to save lives are unfortunately crashing and claiming lives. Reporter: In Wisconsin, the company has temporarily grounded its other copter while the investigation continues. And images from Denver,

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