Officers responded around 7:20 a.m. to the area of Lincoln Marsh near the Union Avenue trailhead in Wheaton, police said.
A person who was walking on a trail in the area reported discovering a deceased individual. Police later confirmed a body was found.
The age, gender and identity of the deceased person were not yet known.
There is no current threat to the public, police said.
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The Wheaton Police Department continues to investigate.