"We have been in communication with the mother throughout the investigation. At this time, I'm not at liberty to discuss her involvement. That's a part of the case our detectives are working on," Pierce said.
Cobb County Medical Operations Manager Mike Gerhard confirmed that the autopsy of the child is complete, but the boy's manner of death has not been released.
Repeated calls to the father's attorney have not been returned, and a woman answering the phone at H. Maddox Kilgore's office said the lawyer would not be commenting at this time.
The father's employer, Home Depot, said through spokeswoman Catherine Woodling that, per company policy, Harris is on a leave of absence without pay.
"It is not appropriate to comment on any new developments in this active investigation. Like the rest of our community, we're deeply saddened by this tragic event and we continue to cooperate with authorities on their ongoing investigation," she said in an e-mail.
Cooper Harris' funeral will be Saturday at the University Church of Christ in Tuscaloosa, Alabama. The service is open to the public.