The child and his mother were found in a Maryland park on May 22
Credit: WUSA

A 3-year-old boy whose mother was found pushing his dead body in a Maryland park swing on May 22 may have had a medical condition, a source with knowledge of the case tells PEOPLE.

“Whether the condition was serious, and what part it played in his death, remains to be seen,” the source says. The source is not authorized to talk to the press and spoke on the condition of anonymity. “Many things are being looked into in order to find out why he died.”

The Maryland coroner who conducted the initial autopsy declined to comment on whether the toddler had a medical condition or what caused his death.

“The case is still under investigation,” says Bruce Goldfarb, a spokesman for the chief medical examiner in Baltimore. “The case is pending, and nothing is being released.”

Investigators are working “full time” to unravel both the sequence of events and physical evidence, says the source with knowledge of the case.

“Among other things, we await toxicology reports and complete medical records,” the source says.

Investigators are seeking medical records on the boy, Ji’Aire, and his mother, Romechia Simms, the source says.

The child’s father, James “Donnell” Lee, and maternal grandmother, Vontasha Simms, have told reporters that they believe Simms has mental health issues.

The mother, who reportedly pushed her son’s dead body in a swing for hours, remains hospitalized, says the source with knowledge of the investigation. “She remains under medical care.”

Lee, who is estranged from Ji’Aire’s mother, posted a video on his Facebook on Wednesday, thanking people who donated to a GoFundMe page for the child’s funeral. More than $10,000 has already been raised through the account.

“I wish I could hug every one of you all around the world,” Lee says in the video. “Hugs going around the world.”

Investigators likely will not have results on the boy’s death for at least a week, says the source with knowledge of the investigation.

Want to keep up with the latest crime coverage? Click here to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter.