Records show Coppell Deputy Chief Matt Kosec quit April 9.
The Dallas Morning News reported Monday that no official findings were made in the inquiry, which stopped with the resignation. The newspaper secured the documents through an open records request.
Investigation notes indicate Kosec said he instructed an employee to show another worker the photos from the suspect's cellphone. The records say Kosec said seeing the photo would be rewarding to the officer, "like ha-ha, look at that guy we are putting in jail."
Details weren't immediately available on the assault case.
Kosec didn't immediately comment about release of the documents.
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