Though wounded herself, Amy Norred Lefebvre ran from the house with her murdered sister's infant in her arms and her own son in tow, according to a report released Thursday by Athens-Clarke police.
She told arriving officers about the shooting inside 138 Beaver Trail, police said.
"From the fact that (Lefebvre) was able to get the infant and the 4-year-old toddler out, you can surmise she absolutely saved their lives," Athens-Clarke police Maj. Carter Greene said.
"She was very courageous in her actions, and selfless," Greene said. "It took a great deal of courage to do what she did."
Neither child was physically harmed, police said.
Police say 28-year-old Richard Norred shot and killed his sister, Leigh Norred Pope, 29, and wounded Lefebvre, 32, and their mother, Carol Norred, 63, shortly before 1:30 p.m. Tuesday in their home in a quiet neighborhood off Barnett Shoals Road. He then shot himself in the chest with a .380-caliber pistol.
Leigh Pope gave birth to a daughter about three weeks ago.
After the shooting, Lefebvre sought shelter in a bathroom and called 911, police said. Police initially identified her as Amy Norred, but her full name was in the report that was released Thursday.
Lefebvre, a second-grade teacher at Statham Elementary School in Barrow County, told arriving officers what happened. Police entered the home and found Pope and her mother on the kitchen floor.
Carol Norred told officers that her son had shot her and her two daughters, and that he was upstairs, according to the police report.
Police removed Carol Norred and secured the home until back-up officers, including members of the Athens-Clarke police Strategic Response Team, arrived to search the home, according to the report.
Officers who were first on the scene heard a gunshot, but they weren't sure if it came from inside the house or from woods nearby, police said.
After searching outdoors and in the house, officers found Richard Norred in the bathtub of a locked, upper-floor bedroom, with a single self-inflicted gunshot wound, police said.
Though he shot himself in the chest and lost a lot of blood, Richard Norred survived and police expect he will recover and face criminal charges.
His father, who is retired from the U.S. Department of Agriculture, was not home at the time of the shooting.
Carol Norred retired from the University of Georgia's College of Veterinary Medicine.
She and Lefebvre remained at Athens Regional Medical Center on Thursday with non-life threatening injuries, police said.
Richard Norred was at the same hospital, under arrest and charged with murder, according to police.