Justin Ross Harris received another 32 years, to be served consecutively, for convictions on four other counts.
Harris, 36, who appeared in an orange jumpsuit with his wrists shackled at his waist, cast his head slightly downward as the sentence was handed down yesterday, the CNN reported.
In addition to the life term, Cobb County Superior Court Judge Mary Staley Clark from Miami gave Harris a 20-year sentence on a conviction for first-degree cruelty to children and another 10 years for sexual exploitation of children.
Harris' legal team offered no mitigating circumstances or evidence ahead of the sentencing. Assistant District Attorney Chuck Boring told the court that this was a matter of the defence team's "trial strategy."
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"There's not much to argue or say," Boring said.
"The jury verdict basically says it all."
The only sentence that matches the "evil nature" of Harris' crimes, Boring said, is life in prison.
Harris' lawyers, who claimed the boy's death was a tragic accident brought about by a lapse in memory, say they intend to file a motion for a new trial, the report said.
It was June 18, 2014, when Harris strapped his son into a rear-facing car seat and drove from their Marietta, Georgia, home to Chick-fil-A for breakfast, then to The Home Depot corporate headquarters, where he worked. Instead of dropping Cooper off at day care, Harris left him in the car all day, testimony found.
Sometime after 4 PM that day, as Harris drove to a nearby theatre to see a movie, he noticed his son was still in the car. He pulled into a shopping centre parking lot and pulled Cooper's body from the SUV. Witnesses said he appeared distraught and was screaming.
Some of the explicit messages were sent the day Cooper died, they said.