Police Chief Ed Kraus said earlier Tuesday that a gun was found in the room after authorities entered the home, but he added that "it makes sense that she would have a gun if she felt threatened or thought someone was in the backyard."

Police on Monday arrested Dean to face one count of murder.

Jefferson's family has called for an independent investigation into the shooting. Police said Monday that they've presented the case to the Texas Rangers, who declined to take it, and to the FBI.

Update 11:25 a.m. EDT Oct. 15: Police Chief Ed Kraus confirmed Tuesday that Fort Worth police arrested Aaron Dean on Monday night without incident. Kraus said Tuesday that Dean had yet to give a statement on the shooting to police.

Dean joined the Forth Worth Police Department in August 2017 and resigned Monday amid an investigation into the shooting of Atatiana Jefferson, 28, Kraus said.

"There's absolutely no excuse for the incident and the person responsible will be held accountable," Kraus said Tuesday during a brief and emotional news conference. "I don't have any officers saying this action should not have been taken against this individual, this officer. I'm getting the opposite reaction. ... The officers are hurting." 

He reiterated Forth Worth's city manager, who said Monday that authorities were considering bringing an independent, third party in to review the police department's procedures. Jefferson's family has called for an independent investigation of the shooting.

"We're looking at bringing an independent third party group to come in and evaluate our policies, our practices and our training to ensure that we are above best practice standards," he said.

Update 11 a.m. EDT Oct. 15: Police in Forth Worth are holding a news conference Tuesday morning to provide updates on Monday's arrest of Aaron Dean, the police officer who shot and killed Atatiana Jefferson in her home over the weekend