The discovery was made around 12:30 p.m. Saturday in the unit block of Ray Street.
Police said a woman spotted the body of a man, around 20-30 years of age, showing signs of decomposition in her backyard.
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There were no obvious signs of trauma and the body was turned over to the Division of Forensic Science, police said.
So far, no word on a cause of death.
Anyone with additional information is asked to contact police at 302-366-7100 ext. 3135.
You can send an anonymous tip by texting 302NPD and your message to TIP411.
Information can also be provided anonymously to Crime Stoppers at 1-800-TIP-3333 or via the internet at www.tipsubmit.com where a reward may be available.