The unnamed officer wasn't hurt in the 10 p.m. shooting at the South Side Flats at 1210 S. Lamar St., just blocks from Dallas police headquarters in the Cedars.
The uniformed officer returned to what she thought was her apartment after her shift and encountered Jean, Hall said.
Dallas' police chief says her department is seeking to charge a white officer with manslaughter in the killing of a black neighbour. Then, "at some point", she shot Jean inside his apartment and called the incident into police dispatch. Lawyers for Jean's family had been calling for Guyger's arrest, saying the fact that she had remained free days after the shooting showed she was receiving favourable treatment.
"We would talk about everything, about politics", said Ms. Jean of her son, whom she would call every day.
Hall didn't address whether investigators believe race was a factor in the shooting.
Authorities haven't said how the officer got into Jean's home, or whether his door was open or unlocked.
Botham Shem Jean, 26, was the son of Mrs Allison Jean, former Permanent Secretary in the Ministry of Education, Innovation, Gender Relations and Sustainable Development and Mr Bertram Jean, Stores Supervisor at WASCO.
The man was later pronounced dead in hospital. Clark, 22, was fatally shot earlier this year by officers in the backyard of his grandparents' home in Sacramento, California.
"I didn't know she was white until now", Jean's mother said. "Botham frequently led worship for chapel and for campus events such as Uplift, and this morning, President Bruce McLarty shared his favorite memory of Jean with students in chapel".
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The officer, who was not injured, will be placed on administrative leave pending the outcome of the investigation.
The chief said blood was drawn from the officer to test for alcohol or drugs in her system. A source told the reporter the officer was exhausted and walked into the wrong apartment by mistake, and that she was a five-year veteran of the Dallas Police Department.
Police called the situation "very unique". "We understand the concerns of this community and that is why we are working as vigorously and as meticulously as we can to ensure the integrity of this case". Police say the officer explained that she had mistakenly entered Jean's home, thinking it was hers.
"We have reassured them that we are working diligently and that we have invited an outside agency to investigate this", she said.
This Feb. 27, 2014, portrait provided by Harding University in Searcy, Ark., shows Botham Jean.
"This is a awful tragedy", the company said in a statement".
Dallas Police Chief U.
Though police did not identify Botham Shem Jean as the victim, the Dallas Morning News and relatives on social media confirmed it was him.