Dallas police officer Amber Guyger was sacked after an investigation determined she "engaged in adverse conduct when she was arrested for manslaughter" in the killing of her black neighbor, officials told FOX News.
Renee Hall terminated Guyger, who was arrested for manslaughter in the shooting death of Botham Jean, 26.
Guyger was charged with manslaughter in the killing; she is now free on $300,000 bond.
A four-year veteran of the department, Guyger has the right to appeal the disciplinary action, according to the tweet.
The Associated Press reports that Dallas has let Guyger go, citing the allegations against her, following an internal investigation into Guyger's behavior. The criminal investigation in the case is ongoing.
Guyger was arrested three days after the incident after the Texas Rangers made a decision to postpone pursuing a warrant "until they could follow up on information that they received from the interview with the officer". Guyger claims she walked inside, saw someone she thought was a burglar, drew her gun and opened fire.
Guyger reportedly moved out of the Southside Flats apartment complex - located just blocks away from Dallas police headquarters - last week.
Guyger has been with the department since 2013. The Dallas Police Department did not release details of its deliberations.
She had been on administrative leave, as activists called for her immediate firing.
Police executed multiple search warrants at Botham Jean's apartment in the aftermath of the killing, and investigators said they found several items, including a small amount of marijuana, FOX4 News reported. Two days later, protesters wheeled a coffin to the entrance of AT&T Stadium before the Cowboys-Giants game as part of a symbolic funeral procession for Jean.
The Dallas County medical examiner's office said Jean died of a gunshot wound to the chest and abdomen.