Her testimony in court Friday marked the first time the public has heard directly from the 31-year-old former officer about her account of events.
Shook went over much of the evidence presented during the trial as he framed Guyger's actions as "a series of terrible mistakes".
When the Murder trial for Amber Guyger resumed after lunch Friday Guyger was no longer testifying.
September 11, 2018 - Lee Merritt, an attorney for Jean's family, calls Guyger's story "highly implausible".
Guyger, who is white, was off duty but still in uniform when she shot Jean, who was black. Her apartment was one floor below Jean's.
He argued that Jean was coming towards Guyger when she opened fire, not getting off his couch as prosecutors suggested.
Guyger missed several signs indicating she was on the wrong floor and at the wrong apartment, prosecutors argued.
A jury is deliberating the case of a Dallas police officer who fatally shot her unarmed neighbor in his apartment previous year.
Closing arguments began the day after what would've been Botham Jean's 28th birthday. The trial began a week ago.
Guyger has said she thought Jean's apartment was her own when she opened his door and shot him, mistaking him for a burglar.
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Guyger said during tearful testimony last week that she acted because at the time she had believed her life was in danger. "It's about being scared that night", she said. She was later fired from the force.
Amber Guyger's defense team said Monday that prosecutors are relying on "sexting and speculation" to convince jurors that the former Dallas police officer was unreasonable in killing a man in his own apartment.
While on the stand, Guyger also addressed her own past growing up in Arlington, a suburb of Dallas.
Texas Ranger David Armstrong testified that about a quarter of the 300 residents that investigators had interviewed at Guyger's apartment complex said they had previously put their keys in the wrong door.
Under questioning, Guyger said she did some CPR, but added that her training had been limited and that she "had never tried it on a person" before. Assistant District Lawyer Jason Hermus requested Guyger.
"I looked at my phone because I didn't want to see his body", she said in a voice that was decidedly absent of the same soft-spoken voice she displayed when she first took the stand. Prosecutors also say Jean was no threat to Guyger, noting that he was in his living room eating a bowl of ice cream when she entered his apartment.
"I would expect that it would be painful", Gwin testified about the massive internal bleeding that Guyger caused because she was allegedly too exhausted or busy sexting to pay attention to where she was going.
One of the officers who responded to Guyger's 911 call later testified that if he had confronted an intruder at his home he probably would have taken cover and called for backup rather than shooting the person.
A Dallas police officer broke her silence Friday about the night she killed a young accountant who lived in the apartment right above hers, telling jurors that she has to live with the guilt every day and that she wished their roles were reversed.
Botham Jean leading worship at a Harding University presidential reception in Dallas on September 21, 2017. Guyger is accused of shooting and killing Botham Jean, an unarmed 26-year-old neighbor, in his own apartment last year.