A Fort Worth, Texas, police officer who fatally shot a 28-year-old woman in her own home on Saturday morning, Oct. 12, has been charged with murder, authorities said.

Officer Aaron Dean, who is white, fatally shot Atatiana Jefferson, a black woman, in her Fort Worth home while responding to a welfare call at around 2:30 a.m.

In a bodycam video released by the Forth Worth Police, you see a man reportedly Dean, creep up to a window in her backyard … and almost instantly fire a shot after seeing Jefferson approach from inside, TMZ reported.

The man quickly told Jefferson to put her hands up, but barely gave her any time to respond … and he also did not identify himself as a police officer.

He shot Jefferson in front of her 8-year-old nephew as they were playing video games together in the house, police said.

Authorities moved quickly to arrest Dean after the incident. It’s unclear how exactly he was taken into custody, but Dean’s arrest comes hours after he turned in his abrupt resignation … and reportedly refused to cooperate with the investigation.

“Had the officer not resigned, I would have fired him for violations of several policies, including our use of force policy, our de-escalation policy, and unprofessional conduct,” Fort Worth Police Chief Ed Kraus said, ABC News reported.

Dean, who was hired by the police force in August 2017 and was commissioned as a licensed peace officer on April 13, 2018. He was released on bond from Tarrant County Jail late Monday, according to court records.

“I certainly have not been able to make sense of why she had to lose her life,” Kraus said at a news conference. “On behalf of the men and women of the Fort Worth Police Department, I’m so sorry for what occurred.”

Jefferson was a pre-med graduate of the Xavier University of Louisiana, who dropped her career ambitions to return home to Texas to care for her ailing mother, Jefferson’s sister, Ashley Carr, said. She was also helping her sister, who recently underwent heart surgery, raise her two young children.