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Officials in Iowa are investigating the death of a police dog that was left in his handler’s truck for nearly 24 hours on a day when the temperature soared to nearly 90 degrees.

Bear, a police dog with the Boone County Sheriff’s Office in central Iowa, was found dead the evening of Sept. 2 by his handler, former Boone County Sgt. Dallas Wingate, the Ames Tribune reported.

Wingate told investigators he had put the dog in his truck around 10 p.m. Sept. 1 because the dog was barking at a deer, according to documents related to a search warrant in the case. Wingate said he only remembered doing so after he went outside to feed his other dogs around 8 p.m. the next night and didn’t see Bear among them.

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The high temperature on Sept. 2 around Boone was 89 degrees, which would have sent the temperature inside the truck well over 100 degrees.

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Iowa officials are investigating the death of an Iowa police dog after it was left inside a hot truck for over 24 hours.

Wingate was placed on administrative leave after the dog's death, and he resigned from the Boone County Sheriff’s Office effective Sept. 8.

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Story County Attorney Tim Meals and the Iowa Division of Criminal Investigation are investigating the dog’s death.