AURORA, Colo. - The discovery of a man's body at an Aurora townhome complex is now being investigated as a homicide.

Aurora Police spokesman Officer Frank Fania called the death “suspicious” Tuesday, but it wasn’t ruled a homicide until after the Arapahoe County Coroner’s Office completed its autopsy Wednesday morning.

The body was found outside a condo unit in the 11900 block of East Cornell Circle at about 8:10 a.m., Fania said.

Although the death was ruled a homicide, police and the coroner’s office haven’t disclosed the cause of death or the identity of the deceased.

One neighbor offered details on what he heard and saw Tuesday.

"'He got stabbed,' is what I was told from the officers," said the neighbor, who wanted to be identified only as "Alex."

Investigators were on the scene much of the day, collecting evidence and marking a trail of blood leading to a side gate.

"The body's laying in the back yard with the door open. He's naked and has basically one shoe on," Alex told 7NEWS.

Neighbors said the man, who is in his 20s, was found by his grandmother. She went to check on him after she hadn't heard from him for several days.

"She hasn't heard from him and she decided to come and see him and she found him in the back," neighbor Valerie Solis said.

Aurora Police are asking anyone with information on this homicide to call Detective Mark Yacano at (303)739-6090.