A construction worker may be seriously injured after falling off the roof of a wooden construction building in Monroe, according to the fire chief. Monroe Fire Chief Dan Smits said the building partially collapsed around 2:50 p.m. Tuesday. Officials with the Occupational Safety and Health Administration and the Monroe Police Department are investigating the incident. The building is going to be used as a warehouse for packaging operations and was about 50 percent complete. Smits said construction workers were in the process of putting on the roof when the building collapsed and the person fell.