Prosecutors claimed that Guyger was so wrapped up in her steamy texts that she went into auto-pilot mode, shooting Jean, who was sitting in his living room eating a bowl of ice cream.
Guyger, who was kicked off the police force after she killed her neighbor, Botham Jean, told the court that she meant to kill him when she pulled the trigger, which she said is what she had been trained to do.
She testified that Jean began to approach her, saying, "Hey, hey hey!" in what she believed was an aggressive tone before she fired the two shots that killed him. Hermus asked her why she didn't warn officers that Jean might have a weapon when they entered his apartment.
Defense attorney Toby Shook said in closing arguments Monday that Amber Guyger's shooting of Botham Jean a year ago was the result of "a series of awful mistakes". "Let me see hands!" she said.
"Who would not have sympathy for Botham Jean?".
She opened the door and saw someone inside in the darkness.
During her testimony, Guyger cried and wiped away tears. Guyger, is now facing murder charges for Jean's death.
TOBY SHOOK: First, tell the jury exactly how loud you said, let me see your hands.
Guyger, who is white, said she mistakenly thought she had parked on her own level in her apartment building's parking garage after her shift.
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The first half was slightly curious, in that it was an absorbing watch but not a huge amount actually happened. Mata advocated against a change of manager, adding: "It is the easy thing to do".
Under cross-examination, the prosecution pointed out that Guyger's emotional appearance in court belied her actions the night she killed Jean, when he said she was not in tears while sitting comfortably in the squad auto using her phone.
She told the court that she was "so sorry" for the fatal run-in and that she "wished" that Jean "was the one with the gun that killed me".
In her testimony Friday, Guyger, 31, repeatedly apologized for killing Jean, who was black.
Guyger said her heart rate skyrocketed as she opened the door fully to take on the threat.
September 24, 2018 - Dallas Police Chief Renee Hall announces Guyger has been fired.
The prosecution argued on cross-examination that she cared more about herself at that moment than the man she had just shot. Instead, she chose to become the aggressor, he said. As a young child, she told jurors, she had always wanted to be a police officer.
Guyger then reenacted how she reached the apartment door she believed was hers, with her backpack, lunch box and police vest in her left hand and said she heard the sound of someone walking around inside. "I truly believe that she inflicted tremendous evil on my son".
Though prosecutors objected to the defense applying castle doctrine or stand your ground laws in the case because Guyger was in Jean's home, not the other way around, the judge allowed it, and the defense leaned on it in closing arguments.
Earlier this week, Texas Ranger David Armstrong told jurors that almost a quarter of the almost 300 residents who lived in the third and fourth floor of the complex told investigators they had put their own key in the wrong apartment door at some point, CNN reports.
September 11, 2018 - Lee Merritt, an attorney for Jean's family, calls Guyger's story "highly implausible".