Police want to know what prompted the attack and why no one stepped in to help.
According to CNN, authorities identified the suspect as Mustafa Guyton, a man who lives near the intersection where that beating took place.
Police say the victim, 33, was walking down the block when the suspect approached him. The camera panned away, but you can see in the next shot the suspect kicking the victim and stomping on him.
No motive has been released. After the attack, the suspect picked up a backpack and walked away.
Three people were seen on the surveillance footage walking by and seemingly doing nothing.
Guyton remains at large. Police hope the surveillance video and photo of the suspect will help them track him down.
CNN contributed to this report.
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