The case has attracted intense national scrutiny for its odd circumstances and as one in a chain of shootings of black men by white police officers.
Amber Guyger, 31, has said the shooting previous year happened after she entered the neighbor's apartment by mistake.
The police force partner of former Dallas police officer Amber Guyger acknowledged that they had a sexual relationship and exchanged sexually explicit text messages and photos with her the day she shot Botham Jean.
After the incident, she was initially placed on administrative leave but was sacked days later, with the Dallas police chief citing her actions on the night she shot Jean and afterwards.
Authorities said Friday, Sept. 7, 2018, that a Dallas police officer returning home from work shot and killed Jean, a neighbor, after she said she mistook his apartment for her own.
Accused killer, Police Officer Amber Guyger, (l.) and Caribbean immigrant victim, Botham Jean at r.
Prosecutors are expected to grill Guyger on how and why she mistook Jean's fourth floor apartment for her own on the third floor. "I thought I was in my apartment, and I shot a guy thinking that he was-thinking it was my apartment". She has pleaded not guilty, and faces up to life in prison if convicted.
Though each apartment required a "unique door key, with an electronic chip" to gain access, Jean's front door was "slightly ajar" when Guyger arrived and it opened "under the force" of her entering her key, the affidavit claims.
In his opening statement, defense attorney Robert Rogers rejected the prosecution argument that there were unique signs that would have signaled to Guyger that she was on the wrong floor.
Throughout the five minute phone call, Guyger cursed, cried and urged Jean to stay alive.
Guyger's defense had pushed for a change of venue, arguing in court last week that media coverage had been so intense their defendant could not get a fair trial, but Kemp denied that request. The officer called dispatch to report that she had shot the man Thursday night, police said.
Guyger's attorney will present an opening statement later Monday.
"Jean had an enthusiasm for life that was contagious", the complaint said.
The civil case has been put on hold by a judge until the completion of the criminal case, according to Daryl K. Washington, another attorney for the Jean family.
The outcome may hang on whether the jury believes that Guyger's mistake was reasonable, according to legal experts. She was booked, but posted bond and was released within an hour. Guyger was sacked after Jean's death. Creuzot is not one of the trial prosecutors. It was also made public that marijuana was found in Jean's apartment, which was seen by some as an attempt to attack his reputation.
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