An autopsy has been completed on the 3-year-old boy found Friday in La Plata, Maryland, but the cause of death was still under investigation, Charles County Sheriff's Office spokeswoman Diane Richardson said Monday.
The 24-year-old mother was taken to a hospital Friday. Richardson said the woman remained hospitalized Monday. Officials haven't identified her. They've said she may have been at the park for hours before the boy was discovered.
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Detectives were working to establish a timeline of the days before his death, Richardson said. Previously, she said there were no obvious signs of foul play but that it hadn't been ruled out.
Also Monday, a woman who identified herself as the child's maternal grandmother, told a TV station her daughter had been diagnosed with a mental illness a few months ago and had been seeking help. She didn't give specifics.
The woman, who identified herself as Vontasha Simms, also told WUSA-TV her daughter ordinarily "would never harm my grandson in any type of way."
Police have not commented on details of the investigation or whether mental illness played a role.