LOUISVILLE, Ky. (WDRB) -- The focus could be changing after a toddler died when he was left in a hot car.

More search warrants were released Monday in the investigation into 22-month-old Cooper Harris' death. Those warrants seek medical records, a DVD and memory cards.

Right now, only the boy's father -- Justin Ross Harris -- is sitting in a Georgia jail charged with murder, but the investigation may be shifting to the toddler's mother, Leanna Harris.

Police say both parents searched for information about child deaths on the Internet.

In court last week, both sat stoic as detectives detailed Leanna Harris' reaction after she learned her son was never dropped off at daycare.

"In front of several witnesses, all of sudden she states, 'Ross must have left him in the car,'" said Det. Phil Stoddard of the Cobb County Police. "They tried to console her and they're like, 'No there's a thousand reasons. He could have taken him to lunch or something. We don't know yet.' And she's like, 'No.'"

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