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A grief-stricken family demanding action.

(SOUNDBITE) (ENGLISH) Jefferson's brother, Darius Carr SAYING:

"This man murdered someone. He should be arrested."

And a city promising to deliver them justice.

(SOUNDBITE) (ENGLISH) FORT WORTH INTERIM POLICE CHIEF ED KRAUS SAYING:

"This will not be an opportunity for us to make excuses. But rather to investigate this case to the fullest."

On Monday, relatives of a Fort Worth woman shot dead by a police officer demanded the officer be fired and an independent agency investigate the killing.

28-year-old Atatiana Jefferson was killed by a single shot on Saturday when an officer fired through a window into her home - while responding to a call for a wellness check.

Body cam footage shows officers circling the home armed with guns and flashlights.

The officer fired less than a second after giving this command.

(SOUNDBITE) (ENGLISH) UNIDENTIFIED OFFICER SAYING:

"Put your hands up. Show me your hands." *Shoots*

In her final minutes, her family said, Jefferson was playing video games with her nephew.

The 8-year-old's mother says the boy witnessed the shooting.

(SOUNDBITE) (ENGLISH) AMBER CARR, JEFFERSON'S SISTER, SAYING:

"The first thing he told me was he was sad and I asks him why. Because he said the police had shot his aunt."

[flash]

(SOUNDBITE) (ENGLISH) FORT WORTH MAYOR BETSY PRICE SAYING:

"There is nothing that can justify what happened Saturday morning."

The city of fort worth, including the Mayor, city manager and chief of police apologized profusely to the family.

(SOUNDBITE) (ENGLISH) FORT WORTH INTERIM POLICE CHIEF ED KRAUS SAYING:

ON behalf of the men and women of the department, I am so sorry about what occurred.

The police chief said he'd intended the fire the cop over his conduct, but the officer quit.

That left the department free to name him.

(SOUNDBITE) (ENGLISH) FORT WORTH INTERIM POLICE CHIEF ED KRAUS SAYING:

Aaron dean was the officer who responded to the call and fired the shot that killed atatiana.

The police chief said he would likely have an update on criminal charges against the officer Tuesday.

And he'd reached out to the FBI to investigate possible federal civil rights violations.