Much of the focus in Cooper Mills Harris' death has been on Justin Ross Harris, the father who failed to drop the toddler off at day care.
The 33-year-old Georgia man faces charges of murder and child cruelty in the case, but authorities have repeatedly mentioned the actions of his wife, Leanna. She has not been charged with any crime.
Leanna Harris told CNN at the beginning of the investigation that a lawyer had advised her not to speak to the media, so not much is known about her. A new set of search warrants obtained by CNN on Monday detailed authorities' focus on computer hardware, as well as her son and husband's medical records, but didn't shed much light on her involvement in the case.
Still, questions persist.
Here's what we know about the mother whose toddler died in a hot car in Cobb County on June 18.
1. Who is she?
Leanna Harris is a 30-year-old dietitian licensed in Georgia and Alabama, records show. She's lived in Georgia since 2012.
While CNN affiliates report that she worked out of her Marietta home, she is employed by DaVita Inc., a Demopolis, Alabama-based health care firm.
Before moving to Marietta, she lived in Moundville, Alabama, a town of about 2,400 people 17 miles south of Tuscaloosa, home to her and her husband's alma mater, the University of Alabama.
She moved into her Moundville home in 2007 and apparently worked at some point as a dietitian for DaVita during her time there, records show.
2. Does she have a happy marriage?
She and Ross Harris had their eighth anniversary in May.
We haven't heard from Leanna Harris, but Ross Harris told police he was happily married, according to background in one of many search warrants issued in the case.
"Nonetheless, evidence of inappropriate sexual communications with other women has been obtained," the warrants say.
In court last week, a detective alleged that while Cooper was dying in his father's SUV, Ross Harris messaged six women, sending and receiving explicit texts -- some including nude images -- during work. One of the recipients of Harris' messages was underage, said Cobb County police Detective Phil Stoddard.
Stoddard also said that messages between Leanna and Ross Harris indicated the two were having financial problems and that Leanna had made complaints about some purchases Ross had made.
He did not elaborate, but a search warrant says the two had "outstanding student and car loans," and Ross Harris had recently incurred about $4,000 in credit card debt to acquire airline miles.
A friend of the couple, Winston Rowell Milling, however, told the court that things seemed normal. Milling and his wife had joined Ross and Leanna Harris for festivals, picnics, hiking on Kennesaw Mountain and other family events. Both parents seemed to have a loving relationship with Cooper, he said.
3. Is she a suspect?
Leanna Harris has not been named a suspect. Officer Michael Bowman, a Cobb County police spokesman, said Monday, "Leanna Harris has been interviewed. Detectives continue to work on the case."