Sandra White, 39, and her 16-year-old son Arkeyvion White, were shot and killed along with White's boyfriend in a murder-suicide on Thursday.
According to CBS, Anetria White called law enforcement after seeing her sister Sandra's lifeless body in her garage. Two police officers responding to the call were met with gun fire as they entered the home in Stockbridge, Georgia.
The gunman, now identified as 49-year-old Anthony Bailey Jr., barricaded himself inside the house and announced that he was holding a hostage against his will. A negotiator was called to the scene and a 15-hour standoff between police and Bailey began.
After hours of pleading with Bailey to release the hostage, officials sprayed tear gas into home late Thursday night. He refused to "provide proof" of the hostage's well-being and responded with more shots.
The television outlet claims other officers forced their way into the home in the pre-dawn hours Friday morning and discovered three dead bodies.
Sandra, who was eight months pregnant, was found dead in the home's garage, while her son, a high school football player, was found in an upstairs bedroom. The suspect's body was found in the same room as the teen’s body.
Anetria told CBS, "I don't know what to say. If you come over to your sister's house and you see her dead in the garage and then you wait from 11 o'clock in the morning until now you find out all three of them are gone."
Members of White's family said Bailey was her boyfriend and the father of her unborn child. According to CBS46, White had been "unhappy" with Bailey for years and served him eviction papers last month, but he refused to leave.
The officers shot during the standoff were treated for non-life-threatening injuries at a local hospital.