A 3-year-old boy in Nebraska has died after a car power window closed on his neck.

Colfax County Attorney Denise Kracl said Everton Isay Romero Romero never regained consciousness after the window closed on him on April 15 in Schuyler, northwest of Omaha, where he lived.

Kracl said it is unclear how the window button was activated in the parked car.

Everton's mom had powered the rear window down. Investigators couldn't determine how long the window was closed on the boy's neck.

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Kracl says no autopsy was performed because there was no evidence any law was violated.

She said the boy's mother "acted appropriately the entire time".