A tragic incident unfolded in Chicago as a 1-year-old boy succumbed to injuries after falling from a building on the city’s North Side, according to the Cook County Medical Examiner’s Office.

The heartbreaking event occurred in the Edgewater neighborhood, specifically on the 5800 block of North Sheridan Road, at approximately 11:30 a.m., as reported by local authorities.

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The young boy plummeted from the fourth floor of the residential building, sustaining a serious head injury in the process, police revealed.

Emergency responders rushed him to St. Francis Hospital, where he was admitted in critical condition.

RELATED: 3-year-old miraculously survives a five-story fall from an apartment window, described as ‘incredibly fortunate.’

What led up to the fall was not immediately clear.

No other injuries were reported.

Area Three detectives are investigating.

Another building resident said he performed CPR on the child until paramedics arrived. He said his thoughts are with the family.

Marion Lenz said he was outside, in front of the building, when the child’s father came rushing up to him, pleading for help, with the baby in his arms.

“I, you know, went in, got my phone, called 911. And as 911 was telling me how to do CPR until the paramedics arrived, and then the paramedics came and took over and all that stuff,” he said. “I’m still in shock from it. Like, it was, like you’re sitting there. And you’re going through everything, and like I just kind of broke down afterward. It was crazy.”

That neighbor says the windows of the building slide open sideways. And there are window screens.