Guyger, who is white, lived in the same apartment building as Jean, who was black.
Guyger had walked up to Mr Jean's apartment - which was on the fourth floor, directly above hers on the third - and found the door unlocked.
In a text message exchange dated September 4, 2018, two days before she murdered Jean, a friend told Guyger that she should adopt a german shepherd, "although she may be racist", the dog's owner said.
The testimony came during the sentencing portion of the murder trial of Amber Guyger, who was convicted of murder Tuesday and faces a sentence that could range from two years to life in prison, depending on what the jury decides.
They also asked why Guyger didn't radio in for help when she thought there was a break-in at her home.
Cheers erupted in the courthouse as the verdict was announced, and someone yelled "Thank you, Jesus".
A native of St. Lucia's in the Caribbean, Jean was 26 when he died, and worked at PwC in risk assurance. He alleged that Guyger should have known that she was entering the wrong apartment. However, another fellow officer, Thomas MacPherson, told jurors that some of those texts sounded "out of character" for Guyger. Guyger said she felt threatened and acted in self-defense.
FacebookAmber Guyger and Botham Jean.
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Guyger also had a habit of liking violent Pinterest posts, including one that reads, "I wear all black to remind you not to mess with me, because I'm already dressed for your funeral". Whatever motivations drove Guyger to shoot, it was clear she was never in danger and had every opportunity to realize her mistake and leave Jean alone. Jean, 26, was gunned down while eating ice cream and watching television.
Amber Guyger took the stand on Friday, the fifth day of the trial.
According to NBC Dallas, Guyger could face between 5 and 99 years in prison on a murder conviction. Jean's mother raised her fists above her head, looked upward and quietly said, God is good.
The new texts introduced after the verdict showed her mocking black officers working for the Dallas Police Department with her partner, officer Martin Rivera.
"I was scared he was going to kill me", Guyger told the jury when she took the stand to testify on her own behalf. The prosecution argued that because she did not immediately call backup and step away from the door upon discovering an "intruder", she ignored obvious signs of a mistake and in doing so became the aggressor. "It sounds so absurd all the things that she missed and all the things that she thought and yeah she thinks it but she is not a reasonable person", he said to the jury.
Guyger denied she is racist. (Tom Fox/The Dallas Morning News via AP, Pool) Also on Wednesday, a friend of Botham Jean told the jury how she had met him at Harding University, a Christian college in Arkansas they both attended. First up was Guyger's mother, who said her daughter Amber was the youngest of three children and was sexually assaulted by a man when she was a young child.
For his part, the prosecutor, Jason Fine, told the jury, "A guilty verdict in this case does not mean you hate police".
On November 30, 2018, Guyger was indicted on the murder charge. If Jean had been a woman or a white man, might that have given her pause, even if it was just for a second or two to reconsider her perceptions?
"The jury is out", he said, "and what they take back to that jury room, in our opinion, is the decision of the value of black life".