ATLANTA — Leanna Harris’ husband, prosecutors alleged this week, had two sides: Churchgoing family man and another, darker persona, one that compelled Ross Harris to knowingly leave their 22-month-old son to die, locked inside a sweltering SUV.

Based on her own, sometimes confounding words, along with evidence disclosed at her spouse’s explosive probable cause hearing Thursday, many are wondering whether there’s another side to Leanna Harris.

The 30-year-old dietitian, who two years ago moved to Cobb County from Tuscaloosa, Ala., has not been charged with any crimes. But police have disclosed that, like her husband, she had researched children dying in hot vehicles before her son Cooper’s death, telling officers it was her “worst fear.” On average, 38 children die each year after being trapped inside automobiles, according to KidsAndCars.org.

Investigators described her behavior the day of her son Cooper’s death as odd, if not suspicious.

When informed by workers at her son’s day care facility that Cooper had never been dropped off, she calmly responded, “Ross must have left him in the car. There’s no other explanation,” according to Cobb County Police Detective Phil Stoddard’s testimony Thursday.

Then, when reunited with her husband at Cobb police headquarters after he had been charged with murder, Leanna Harris asked him, “Did you say too much?” according to Stoddard.

“There isn’t enough to make her a co-conspirator yet,” said criminal defense lawyer Esther Panitch.

Whatever Leanna Harris’ role winds up being in this case — witness, defendant or supportive wife — prosecutors and the public are taking note of her public actions. What they’ve seen so far is stoicism that seems at odds with what has become a public tragedy.

She has expressed little emotion throughout. At Thursday’s hearing, she stared blankly ahead, chewing gum, as prosecutors delivered one bombshell after another.

When she called home June 18 with the grim news of Cooper’s death, her mother could be overheard on the phone: “Why aren’t you crying? Why aren’t you reacting?”

Her response, according to Stoddard: “I must be in shock.”

Then there was her eulogy at Cooper’s funeral last Saturday in Tuscaloosa. To those who don’t know her, Leanna Harris’ comment that she wouldn’t bring her son back, even if she could, seemed suspicious.

“He’s in the most peaceful, wonderful place there is,” Leanna Harris said.

But the 250 or so mourners who gathered at University Church of Christ gave her two rounds of applause, and Harris’ statement is not unusual among the deeply religious who believe the afterlife is God’s greatest gift.

Still, it’s clear, according to veteran legal observers, that police are looking at Leanna Harris’ potential culpability in her son’s death. On Thursday, Cobb District Attorney Vic Reynolds said the investigation continues and “much work remains,” though he offered no details on where their probe may be headed.

“Knowledge of a crime isn’t prosecutable. A cover-up is,” said Panitch.