Story highlights Police say Leanna Harris was questioned about the death of her son

She gave "similar statements" to ones her husband gave about looking on the Internet

Investigators used a warrant to take computers into evidence

Justin Ross Harris is charged with murder, child cruelty

(CNN) Leanna Harris, the mother of a Georgia toddler who died locked in a hot car, has told authorities that she researched such deaths and how they occur, according to a police affidavit.

Her husband, Justin Ross Harris , the child's father, who is in jail without bond, has also told police that he used the Internet to research child deaths in vehicles and what temperature it needs to be for death to occur, police said.

"Justin stated that he was fearful that this could happen," the police affidavit said.

In the document released Sunday, police say that during questioning Leanna Harris "made similar statements regarding researching in car deaths and how it occurs."

The time frame for when this alleged research took place remains unclear.

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