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The 22-month-old Georgia boy who died after being left in the back of his father's hot car had nothing in his blood that suggested he was poisoned or drugged in any way, toxicology results released Thursday show.

Investigators say the tests confirmed their belief Cooper Harris' death was heat-related.The boy's father, Justin Ross Harris, 33, has pleaded not guilty to charges of murder and child cruelty. His attorney, Maddox Kilgore, has repeatedly said that his client accidentally forgot to drop off Cooper at daycare on the morning of June 18 in the Atlanta suburbs.

But prosecutors allege that Harris was having marital problems and left his son to die on purpose because he wanted a child-free life. Justin Ross Harris' wife, Leanna Harris, meanwhile has retained a lawyer, Atlanta defense attorney Lawrence Zimmerman confirmed to NBC News earlier Thursday. Zimmerman would not comment further. Leanna has not been named as a suspect or charged with any crime. Her role in the boy's death has come under increased scrutiny. Both parents admitted to researching hot car deaths online, according to warrants.

Also on Thursday, a spokeswoman for Home Depot said that Ross Harris has been terminated from his IT job at the company. He had previously been on unpaid leave.


— Gabe Gutierrez and Hasani Gittens