CHICAGO (WGN) — A woman was taken into custody on Saturday morning, and a homicide investigation has begun after she allegedly drowned a baby in the lake on Friday night.

Police report that officers initially responded to a service call around 9:45 p.m., where they found a 31-year-old woman in Lake Michigan at the 7000 Block of S. South Shore Drive, close to South Shore Beach.

After arriving on the scene, further investigation indicated that the woman had allegedly drowned a 1-year-old boy in the lake.

Following the discovery, officers took the woman into custody and transported her to the hospital.

Shortly after the woman was arrested, the CFD Marine Unit recovered the body of the child, and he was pronounced dead.

It remains unclear what led to the incident, and an investigation is now underway.

Authorities have not announced charges against the woman or provided details on whether she was related to the victim.