Aaron Dean, the Fort Worth police officer, who fatally shot 28-year-old Atatiana Jefferson in her own home early Saturday morning, has resigned.

Fort Worth interim police chief Ed Kraus made the announcement on Monday adding that the officer “may face criminal charges.”

The officer was conducting a welfare check after Jefferson’s neighbor, James Smith, called the non-emergency line because her door was ajar and the lights were on around 2 a.m.

Related: Neighbor Who Called Police To Atatiana Jefferson’s Home Speaks Out

The officer’s body cam showed he fired the fatal shot, striking Atatiana through a window, just two seconds after calling out a command towards her.

He never identified himself as police. He never gave her a chance.

Atatiana’s eight-year-old nephew was in the room when she was shot and killed.

Related: Atatiana Jefferson’s Father On The Senseless Police Shooting Of His Only Daughter

Fort Worth Mayor Betsy Price said the killing of Jefferson was unjustified:

I’m so sorry. On behalf of the entire city of Fort Worth, I’m sorry.

To Atatiana’s family, it’s unacceptable. There is nothing that can justify what happened on Saturday morning. Nothing.

This story is developing and I will update you as more information becomes available.

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