JACKSONVILLE, Fla. -- Twenty-four hours after a 20-month-old boy was found unresponsive in his caregiver's hot pickup truck, authorities are learning more about what led to the boy's death and his mother is still trying to cope with the grief.

A police officer had to tell Shandaryl Davis hat her son was dead.

"He had said 'Miss Davis, we got some bad news,'" Davis said. "He said 'I got your 3-year-old, but your 1-year-old, he's gone.'"

Police said Bernard Davis was left behind in Shantel Wilcher's pickup when the woman returned to her Westside home after a shopping trip. Three other children -- two her own and Bernard's older brother -- got out and were in the house two hours later when Wilcher realized Bernard was missing.

Detectives said Wilcher found Bernard in the pickup about 3:30 p.m. Wednesday and performed CPR until Jacksonville Fire-Rescue personnel arrived and pronounced the boy dead.

"Not my baby. Not my baby. Oh, God," Davis said.

Within hours, Wilcher was arrested on a charge of interfering with a lawful investigation because police said lied about having a child-care license when she had surrendered it to the state over a year ago.

Wilcher is not charged in connection with Bernard's death, but the state attorney's office could file child neglect or other charges once the investigation is completed.

The Department of Children and Families -- the agency that licenses child-care facilities -- has also launched an investigation in to the boy's death.

"We're hearing more information that she was operating without a license, that's illegal," said DCF spokesman John Harrell.

According to DCF records, while Wilcher held a license between 2006 and 2008, she was cited four times -- mostly for inadequate supervision. In 2006, she was cited for leaving five children with her 15-year-old child.

DCF said Wilcher was director of Teeter Tikes Christian Learning College in Riverside in May 2008 when she allowed children to be taken apartment hunting with a friend. According to records, one of the children's mothers saw them in a car not properly restrained.

When that day care closed, DCF said Wilcher applied to reopen her home day care.

"We were going to deny that application. As a result she terminated her application," Harrell said.

The Davis affectionately called Bernard "Pig" because he loved to eat. They said he was a happy, beautiful boy.

"He always had a smile on his face. He always was happy, him and his brother," his mother said. "Now, I wake up in the morning and I know my (older) son's going to be like, 'Where's Pig at, Mom? Where he at?'"