Frank Warren, 61, died of his injuries.
No one was in custody in the shooting, which occurred in the 6800-block of South Wood just before noon.
Police said the men were unintended victims of an exchange of gunfire between rival gang members.
A witness said the men were eating their lunch on the grass.
Warren was a father of three and one of sixteen brothers and sisters.
"He loved working over there. He knew a lot of people over there. And everybody loved his work," said brother Jimmy Warren. "They've got to stop that. They've got to stop that shooting. I mean killing an innocent man while he's out making a living. What is that?"