WATCH: Police call Yorkville fatal shooting an "unprovoked attack"
Police say a fatal shooting in Yorkville was an "unprovoked attack on a defenseless man."
37-year-old Matthew Staikos, a tech CEO, was shot and killed on Monday night.
Investigators have said that Staikos was shot from behind at close range on Yorkville Ave.
The shooter got away in a silver four-door Mercedes.
Police have released surveillance video of the getaway vehicle.
The suspect is described as a black male, about 5'10" with a slim to medium build, mid-20s to late-30s.