Investigators found a body in an elevator shaft near 17th Street and Boulder Avenue on Thursday morning.
The body was found in the Abundant Life Building, built by Oral Roberts in the 1950s to be the headquarters for his ministry. It has been abandoned for about a decade.
The building is famous for the fact that it was built without any windows, which makes it pitch black inside, even during daytime hours.
EMSA was called just at 4:45 a.m., when witnesses said they "saw smoke and heard an explosion," scanner traffic indicated.
Tulsa police arrived five minutes later to find a body at the bottom of an elevator shaft.
Investigators said it appears transients were trying to escape the cold and wind and entered the building, when one of them fell about 20 feet and died.