Jake Bleiberg, The Associated Press

Dallas police officer Amber Guyger, left, shot and killed Botham Shem Jean in his apartment.
Kaufman County Sheriff's Office via REUTERS: Guyger/Facebook: Botham Shem Jean

The former Dallas police officer who fatally shot an unarmed black man in his own home told a 911 dispatcher "I thought it was my apartment" nearly 20 times as she waited for emergency responders to arrive, according to a recording of the call obtained by a Dallas TV station.