Around midnight Eastern time, authorities said they were devising a plan to remove the body of the worker, which "will be a long operation," the Fire Department tweeted.
At 1:30 a.m., authorities said they would use air bags to lift part of the structure off the victim.
The driver of a semi truck was also injured when he crashed into the rubble just a few seconds after the collapse, Cincinnati.com reports.
"I can tell you that the big rig driver — the semi driver is very lucky," Cincinnati Police Chief Jeffrey Blackwell told reporters. "In a matter of seconds his fate would have probably been different."