CINCINNATI — Officials have recovered a body from the rubble of the now-closed Killen Generating Station collapse, which occurred Dec. 9.

The worker has been identified as Doug Gray, 42, from Greenup County, Kentucky, according to the Detroit-based demolition company Adamo Group. Another worker, identified as Jamie Fitzgerald, 47, is still missing. 

Three workers were rescued and taken to the hospital for their injuries. Their conditions remain unknown. 

Adamo Group sent out a statement regarding Fitzgerald, saying in order to find him, they're going to need to bring in other companies to help remove the debris and identify Fitzgerald's location. The engineering firm Thornton & Thomasetti will develop a plan that will protect workers during the debris removal process. 

Adamo Group estimates it could take up to two weeks. 

"We trust there is an understanding of how his process must be done in a manner that does not pose a safety hazard to those working on the recovery effort and is done with as much sensitivity as is possible. Our thoughts and prayers continue for Jamie’s family, fiancé, friends and co-workers," wrote Adamo Group. 

The Adams County Sheriff's Office says the roof of the power plant collapsed around 8:30 a.m. on Dec. 9, and the cause is unknown. Workers were there prepping the building for demolition. Three workers were saved initially while two of the workers, Gray and Fitzgerald, were searched for throughout the weekend. 

The day after the collapse, officials called it a recovery mission rather than search and rescue. 

Adamo Group says it's fully cooperating with organizations and authorities as they continue to look for Fitzgerald. 

Engineers from Thornton & Tomasetti will be at the site Tuesday along with engineers from OSHA.

The Killen Generating Station began operations in 1982 closed in March 2017 along with the J.M. Stuart Station due to financial and environmental challenges. AES Ohio Generation operated the plant, which is a subsidiary of the AES Corporation.

There's been two recorded incidents in its nearly five-decade history. In 1984, a worker died after getting stuck in a coal chute and another worker died in 1994 from hypothermia on site.