Police investigate the death of a 51-year-old man at Three Oaks Recreation Area in Crystal Lake Tuesday afternoon | Photo: Alex Vucha.

Police said several people are in custody after a 51-year-old man was found dead floating in the water at Three Oaks Recreation Area in Crystal Lake.

The Crystal Lake Police Department responded around 2:59 p.m. Tuesday to the 6100 block of Northwest Highway after receiving an open line 911 call.

Crystal Lake Deputy Police Chief Derek Hyrkas said that officers located three individuals at the location, one of which was covered in what appeared to be blood.

Further investigation led the officers to a secluded wooded inlet on the west side of Three Oaks Recreation Area where they discovered a deceased 51-year-old man floating in the water, Hyrkas said.

Police currently have several subjects in custody, Hyrkas said, adding the investigation remains active and ongoing. None of the subjects have been charged yet.

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The McHenry County Coroner’s Office will release the identity of the man once notification to his family has been made.

“At this time, it appears the victim and subjects in custody were acquaintances. We believe this to be an isolated event with no existing danger to the public,” Hyrkas said.

The Crystal Lake Police Department encourages anyone with information of the case to call 815-356-3620. Anonymous tips can be sent to the Crystal Lake Police Department by texting the word CLPDTIP along with the tip information to 847411.