On Thursday, Grand Rapids Police Department released more details on an investigation involving a body found at Highland Park on Wednesday.

GRPD says the identity of the man found dead in Highland Park on Wednesday is still unknown. His body was one of two found that day.

He is identified as an adult man with the letters "J R" tattooed on his right upper arm. GRPD says his race, or ethnicity, is still unclear. The autopsy results are inconclusive at this time while authorities wait for the toxicology results.

►Related: GRPD investagate murder after body found

Police received a call about a body in the marsh area of the park on Wednesday afternoon. They believe the man had been in the water for days but say there is no obvious signs of trauma.

GRPD asks that anyone who may be aware of a missing man with those letters on his right arm to call the department at 616-456-3400 or Silent Observer at 616-774-2345. Silent Observer can also be reached, confidentially, at www.silentobserver.org

►Make it easy to keep up to date with more stories like this. Download the WZZM 13 app now.

April Stevens is a multi-platform producer at WZZM 13. Have a news tip? Email news@wzzm13.com, visit our Facebook page or Twitter.