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.