ATLANTA >> A Georgia man charged with murder after his 22-month-old son died in a hot SUV searched online for information about kids dying in cars and told police he feared it could happen, according to documents released Saturday as the boy’s family held his funeral in Alabama.

The warrants released by the Cobb County Police Department provide more insight into the investigation of Cooper Harris’ death on June 18.

Justin Ross Harris, 33, has told police he was supposed to drive his son to day care that morning but drove to work without realizing that his son was strapped into a car seat in the back.

In an interview after his son’s death, Harris told investigators that he had done an online search on what temperature could cause a child’s death in a vehicle. The warrant doesn’t specify when Harris did the searches.

“During an interview with Justin, He stated that he recently researched, through the internet, child deaths inside vehicles and what temperature it needs to be for that to occur. Justin stated that he was fearful that this could happen,” one of the four warrants released to The Associated Press stated.

Harris also told police he was on his way to meet friends after work when he realized his son was in the back seat and pulled into a shopping center to get help, according to the warrants.

Harris is charged with murder and second-degree child cruelty in his son’s death, and remained in jail on Saturday as family members held a funeral in Tuscaloosa, Alabama. The Atlanta Journal-Constitution reported that Harris called the ceremony from the Cobb County Jail in Marietta, Georgia, and emotionally thanked people for their support since his arrest hours after the boy’s death.

“(Cooper) never did anything to anyone,” Harris said. “I’m just sorry I can’t be there.”

The boy’s mother, Leanna Harris, also made her first comments about her son’s death and the charges against her husband at the funeral ceremony.

“”Ross was and is a wonderful father,” Harris said to the applause of about 250 mourners according to the newspaper.

Police have said facts in the case “do not point toward simple negligence.” A previously released arrest warrant stated that Harris stopped with his son for breakfast and returned to put something inside his car during the day while the child was still inside. The Cobb County Medical Examiner’s office said Wednesday that it believes the cause of Cooper Harris’ death was hyperthermia and manner of death was homicide.

The temperature that day was 88 degrees at 5:16 p.m., according to a warrant filed the day after the child died.

Police searched the Marietta, Georgia condo where the family lives, looking for a laptop, electronic devices documents, photographs and any “evidence of child neglect, child abuse.” They also searched Harris’ cellphone and the light blue 2011 Hyundai Tucson that Harris was driving when his son died.

In an obituary published this week, the child’s family said Justin Ross Harris and his wife, Leanna, were “the most proud parents there could ever have been.”

Cooper Harris loved trucks and cars, had just learned the color red and was a happy baby, it read.

“His 22 months of life were the most happy and fulfilling times of his mother’s and father’s lives, and we will miss him greatly,” the obituary read.

Associated Press writer Kate Brumback contributed to this report.