"Right now there are more questions than we have answers", Dallas Chief of Police U. Renee Hall told reporters during a news conference Friday afternoon.
According to reports, the officer who shot Jean was returning home, in full uniform, when she encountered the man in an apartment.
The unnamed Dallas officer entered the apartment after her shift on Thursday night and confronted the victim, a 26-year-old male.
The victim, Botham Shem Jean, was a 26-year-old black man. After the officer reported that Jean was wounded he was taken to Baylor University Medical Center, where he was pronounced dead.
When Jean reportedly opened the door, the officer fired her gun immediately and killed him.
The incident was initially handled as an officer-involved shooting, which meant police questioned the officer and took a blood sample but did not take her into custody, and she was placed on paid administrative leave pending an investigation.
Two women who live on the second floor near where the shooting happened said they heard a lot of noise late Thursday (local time).
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"My brother is my best friend", she said. Jean was transported to an area hospital, where he died from his injuries. But given what investigators now know about the case, they chose to pursue the manslaughter charge, authorities said.
The Texas Rangers, a state-wide law enforcement agency, will conduct an independent investigation of the shooting.
"I don't think there was a student on campus who didn't know Botham", said Landis Tindell, who reflected on Botham Shem's service as a resident adviser.
Hall expressed her condolences to Jean's family.
The police department is no longer handling it with their normal officer involved shooting procedures.
Harding President Bruce McClarty remembered how he once asked Jean to lead the chapel in a hymn that Jean had never heard before, according to reporting from the Christian Chronicle. They told The Dallas Morning News that they can open apartments with either standard keys or a keypad code. That July, he went to work for PwC in risk assurance.
"We heard cops yelling", said another neighbor. Activists and religious leaders called for expanded power for the Dallas Citizens Police Review Board, for the arrest of the police officer and for change in DPD's policing.