She was shot when she peered into the darkness.
The Fort Worth police chief says a white officer accused in the fatal shooting of a black woman in her home has resigned.
Dean was responding to a welfare call at around 2:30 AM Saturday after a concerned neighbor said they saw her door open.
"Atatiana was in her own home, caring for her nephew".
"I'm shaken. I'm mad. I'm upset. And I feel it's partly my fault", he told the newspaper.
"If I had never dialled the police department, she'd still be alive".
The neighbor who called authorities to Jefferson's home, James Smith, has since come forward to offer context for the call.
Body camera video footage appears to show Dean and his partner approaching Jefferson's home with flashlights. No one can be seen inside. "When she went to see what was going on she was confronted by an officer with his gun drawn shouting commands".
After demanding that the person put their hands up, an officer then fired through the glass. "Show me your hands", just before firing his weapon once. Her family has said she was watching her nephew at the time. Jefferson died in her bedroom with her eight-year-old nephew in the house.
The department has not named the officer who shot Jefferson, saying only that he joined the department in April of past year.
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Dean, who had been with the department since 2017, did not identify himself as a police officer before opening fire, police said. O'Neil declined to answer. Merritt also represents Jean's family.
Of the nine officer-involved shootings so far this year in Fort Worth, five targeted African Americans and six resulted in death, according to department data.
"It makes you not want to call the police department", he said.
"You didn't hear the officer shout, 'Gun, gun, gun, '" Merritt told Dallas TV station KXAS after viewing video taken from a Fort Worth officer's bodycam.
Kraus said he was scheduled to meet with Dean on Monday morning, but the officer tendered his resignation before they had a chance to meet. "This (the shooting) happened Saturday".
Lee Merritt, an attorney for both Jefferson's family and the family of Botham Jean, an unarmed black man who was shot dead in his home by an off-duty officer in Dallas, criticized that move to CNN, stating that police were possibly attempting to villainize Jefferson. Police said they released the footage to provide "transparent and relevant information to the public".
The ex-officer may also face civil rights sanctions.
The shooting occurred in Fort Worth, about 30 miles (50 kilometres) west of Dallas, where another high-profile police shooting occurred a year ago.
"It's another one of those situations where the people that are supposed to protect us are actually not here to protect us", Jefferson's sister, Amber Carr, told KTVT. "You have to know that was somebody's daughter".
"Our prayers and thoughts are with her family and friends as we gather as a community in prayer", President Reynold Verret said in a letter to the Xavier community.