Michigan State Police said the child had fallen off play equipment while on the lake around 6 p.m. on June 6.
The child later died at the hospital.
State police first responded after receiving reports that a kid had fallen in the water and was no longer breathing.
Witnesses told police that the victim was on a floating play structure in the middle of the main lake when he fell.
(Photo: Camp Dearborn)
The Milford Fire Department transported the 10-year-old to the hospital after finding a pulse, police wrote on Twitter.
After arriving at the hospital, CPR and other life-saving efforts were administered. However, the efforts were unsuccessful. Police said an autopsy is scheduled for Thursday, but "it appears this was a tragic accident."