Teen who died on ATV first shot with stun gun

Just-released video shows police admitting "we tased" 15-year-old before he crashed.
2:40 | 05/15/18

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Transcript for Teen who died on ATV first shot with stun gun
They tagging is like daddy I need to have this kind of event that it is a violation of our department policy to fire teaser from moving via why is on holiday. Amnesty and day. He was found it T on. August 26 last year a Michigan State trooper was in pursuit of fifteen year old to mom Grimes. These videos tell the story of his senseless death yeah. Yeah. Will Grimes wrote Israeli TV and Rossini driving Detroit trooper mark best year's squad car was in pursuit. When Grimes didn't pull over best shot him with a taster a violation of department policy. Grimes crashed into a parked truck planet. So. Yeah yeah. Yeah yeah yeah. Yeah. Nearby officers from MSP and Detroit police respond to the scene. There stay and you for Grimes body east Cooper best yeah. I'll. He needed it. Bill Frist also old. But quickly Grimes condition worsens while other officers watch helplessly. Listen. All weakening or get money ever. And she's. Where most officers arriving on the scene turn their body cameras on some appear to turn theirs off just. As one officer arrives and other approaches placing his hand over her body camera and immediately she turned to camera off. You know he's fifteen. I shot it. Little amount hasn't. And you will EMS arrived at the hospital rhymes was pronounced did. Hours later police were still on the scene as the sun said they used a hose to clean up the crime scene where a fifteen year old lost his life. Neighbors watched in disbelief.

This transcript has been automatically generated and may not be 100% accurate.

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