The victim was attacked on the 2600 block of West Gregory Street, between Washtenaw and Rockwell, around 10 p.m.
The first eyewitness account -- which probably came from the disoriented victim -- described the offender as a black or Hispanic male with light or dark skin... and the suspect was wearing tan shorts.
A second eyewitness saw a shirtless black male wearing sagging jeans running away from the crime scene.
Investigators said someone, most likely the offender, left a baseball cap at the scene.
Apparently, the victim was bleeding so profusely from his face, officers said the offender was possibly covered in the victim’s blood.
At the time of this report, it wasn't clear if the man was attacked during a robbery, an attempted robbery, or for some other reason.
Investigators said the attacker may have been armed with a gun.