Quinisha Renee Brabson was sentenced Monday to serve 16 years in state prison for the shooting death of 50-year-old Timmy Nichols during a late-night drug deal on Main Street on April 8, 2010.
Ms. Brabson, 23, faced 15-25 years to be served at 85 percent before parole consideration.
Judge Rebecca Stern set the sentence after a brief hearing.
The victim's daughter, Tammy Mae Nichols, read a statement in which she said the loss "feels like a bad dream. I can't wake up."
She said her father "was the only person who cared about me in my life."
Ms. Nichols, who hugged Ms. Brabson's mother before the hearing, said Ms. Brabson "has shown no remorse."
The defense did not put on any proof at the trial in late January.
Ms. Brabson had told police she fired at Nichols when she thought he was going to rape a female who was with her.
She said the occupants of a vehicle appeared "geeked out."
Lisa Greenlief said she had gone with Nichols and Jeffery Young to buy drugs. She said they were out of money so they planned to trade a bottle of prescription pills for crack cocaine.
She said they headed for Main Street because "it's a wild place. It's a jungle out there. It's a drug place. It's where you get your drugs."
The witness said Ms. Brabson was dressed in a white shirt and dark pants as she approached the car in company with a man and a woman. She said Ms. Brabson was standing on a sidewalk near the driver's side when she shot Nichols.
Under cross-examination, Ms. Greenlief said she was still in shock from the incident and from a wreck afterward when she was first interviewed. She said then that the shooter was on the other side of the car.
After Nichols was shot, his vehicle accelerated and ran over a stop sign before slamming into a utility pole near the intersection of Main and Willow.
Dr. James Metcalfe, the county medical examiner, said the victim was shot in the back.
Officer Lauren Wenger said she was working her East Chattanooga district the night of the shooting and she went over to Main Street to help look for the shooter. She said she was about to give up and was headed back to her district when she spotted a woman in a white shirt and black pants with two other people. Ms. Brabson was then taken in for questioning.
Det. Michael Wenger said the gun used was never found. Ms. Brabson said she dropped it after the shooting. A woman who lives nearby told of that night seeing three people in her backyard looking for something. She said she hollered at them and they left.
Ms. Greenlief said she is bi-polar and stays off drugs. She acknowledged that Nichols was a cocaine addict. She said, "I tried to get him off of it."
She said of the shooting, "He just held the bottle (of pills) up. He didn't do anything to deserve what he got."
She added, "That girl right there shot my fiancee. He's dead because of her."
Ms. Brabson has remained in jail since the incident.