A Georgia father charged in the death of his 22-month-old son searched for "how long does it take for an animal to die in a hot car," a source with knowledge of the investigation confirmed to HLN's Nancy Grace Thursday.
The source said that the discovery was made on a computer seized from the dad's office.
Justin Ross Harris is charged with second-degree cruelty to a child and homicide-murder during the commission of a felony. Harris said he forgot to drop his toddler off at day care, accidentally leaving the boy in the hot car all day.
Police say the boy, Cooper Harris, was left behind for seven hours on a day when temperatures outside reached the mid-90s. The child died from heat stroke, according to a medical examiner.
A criminal warrant released Wednesday claims that "during lunch said accused did access the same vehicle through the driver's side door to place an object into the vehicle. Said accused then closed the door and left the car, re-entering his place of business."
A witness who works at a pizza shop in the Akers Mills Square Shopping Center described a harrowing scene when Harris approached the store on June 18.
“The car drove up right by the store. An employee came in and said, ‘Call for an ambulance,’ so I dialed it and I walked outside,” said Rodney Smith.
“The child looked sweaty and tired. Two guys started to give the boy CPR. I was on the curb and the father and another individual brought the boy out. The father kept circling around us yelling and screaming, “What did I do? Oh my God, my child is dead!” Smith added.
Cooper’s funeral will be held Saturday in Alabama, where his family is originally from.
Justin Ross Harris is currently being held without bond at the Cobb County Adult Detention Center.