The dead man's mother, Allie Jean, told NBC News she couldn't understand how the officer mistakenly killed her son.
The Dallas Police Department said the officer had just finished her shift and entered what she believed was her own apartment at the South Side Flats.
Believing the apartment was her own, the officer, who was in full uniform, went inside and when she found someone there, pulled out her weapon and fired.
Officers were called to the scene, where they administered first aid to the 26-year-old victim.
Authorities said they are awaiting family notification before releasing the victim's name. The unnamed police officer who killed him was a white woman, NPR's Wade Goodwyn reports.
On Friday morning, police did not immediately explain how the officer became confused as to which apartment was hers, or how she managed to get into the apartment. The officer, who has not yet been publicly identified, has been placed on administrative leave, authorities said.
Jean was a 2016 alumni of Harding University in Searcy, Arkansas.
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Visitors gather near a 5G stand of China Unicom during the Mobile World Congress (MWC) in Shanghai, China June 27, 2018. However, a fomenting trade war with the USA has made expediting 5G development a priority.
Hall declined to comment on the officer's activities prior to the shooting but did say that she was required to provide a blood sample for drug and alcohol testing.
At the very early stages of this investigation - initial indications were that they were what we consider circumstances of an officer involved shooting.
In tribute's posted to social media following Jean's death, the 26-year-old was remembered as a "powerful singer", and a man who "always had a spirit of joy that flowed from him".
"This is a awful tragedy", the company said in a statement.
"We heard cops yelling, but otherwise had no idea what was going on", Hernandez said.
The Dallas Police Department and the District Attorney's Office are conducting a joint investigation. In a service this morning, Harding University President Bruce McLarty shared some memories of Botham with students in chapel.
"Super scary because the police are supposed to protect you and then they come home and, you know, you're just hanging out in your own house and then they come home thinking they're home or whatever", Richard Healy told KDFW. "I love you with all of my heart", she wrote.