ATLANTA - The death of convicted killer Julia Lynn Turner has been ruled a suicide by the Georgia Bureau of Investigation State Medical Examiner's Office.

The former Cobb 911 operator, who was serving two life sentences in prison with no chance of parole for killing her husband and boyfriend using antifreeze, was found dead in her prison cell the morning of Aug. 30. The state medical examiner performed an autopsy, and results of a toxicology test showed a lethal level of the prescription drug propranolol in Turner's blood. Turner had a prescription for the blood pressure medication.

"Toxicology studies revealed that Ms. Turner had a lethal level of this drug in her blood indicating that she had ingested an amount well above the prescribed dosage," Dr. Kris Sperry, Georgia chief medical examiner, said in a release Wednesday. "No evidence of injury or foul play was detected in the course of the autopsy examination. The death is being classified as a suicide."

Upon receiving word of her death in August, Lynn Turner's attorney, Vic Reynolds called it a "tragic ending to a tragedy."

On Wednesday, Reynolds said he was surprised and shocked to hear that Lynn Turner had committed suicide.

"The strongest emotion is one of surprise," Reynolds said. "I didn't see that happening, even under the circumstances, I didn't see that happening. ... Knowing her and getting to know her during the course of the trial, I'm deeply sadden by it and for her children and her family. It's just a tragic situation for everyone involved."

Reynolds said suicide was something that was out of character for the mother of two.

"She still had two children out in the free world that she communicated with and got to see on visitation basis," he said.

Reynolds, who defended Lynn Turner in both murder cases along with his law firm partner Jimmy Berry, said he believed the Lynn Turner was still in the process of appealing her case in Forsyth County at the time of her death.

Dubbed the "black widow," Lynn Turner, 42, was first convicted of killing her husband, Cobb police officer Glenn Turner, in 2004. She was later convicted of murder in 2007 for killing Randy Thompson, her live-in boyfriend and the father of her two children.

Lynn Turner's husband, Glenn Turner, died in 1995 from what was believed to be an irregular heartbeat at the time. Roughly six years later, in January 2001, Lynn Turner's boyfriend Randy Thompson, a Forsyth County firefighter, was found dead. An autopsy of the firefighter's body revealed the presence of oxalate crystals in his bloodstream, which form when the body metabolizes antifreeze. Thompson's death was later ruled a homicide.

Following Thompson's death, GBI officials ordered the exhumation of Glenn Turner's body in July 2001 and also found the presence of oxalate crystals in his body. Glenn Turner's death was then ruled a homicide and Lynn Turner became the main suspect in both cases. She was indicted for the murder of her husband in November 2002 in Cobb County. The trial was later moved to Perry because of pre-trial publicity surrounding the case.

In both cases, the prosecution claimed that Tuner had repeatedly poisoned her victims and that her motive was money and lust. According to court testimony, Turner was dating Thompson when she murdered her husband. Turner received more than $250,000 in insurance and Social Security benefits in the deaths of both her husband and Thompson.

Both trials garnered national media attention and the trial for the murder of Glenn Turner was broadcast on Court TV. Cobb District Attorney Pat Head called the case the first of its kind in the nation.

When Lynn Turner died in August, Head remembered her as strikingly unemotional.

"Something that I found remarkable when they read the verdict was that the expression on her face didn't change," Head said. "She simply reached up and took her earrings off because she knew she was going into custody."

Her attorney said he saw a warmer side to the convicted killer.

"It's like any other case when you defend an individual, you see a side of them that the public doesn't see," Reynolds said. "We saw a side of Lynn that was a loving mother. She loved her children very much - doted on them and bragged on them."