An Iowa truck driver died Monday after being crushed by a load of pipe he was delivering to the cleanup site of a massive coal ash spill in Tennessee, authorities said.

Larry LaCroix, 55, of Fort Madison, Iowa, died at University of Tennessee Medical Center in Knoxville, Tennessee Valley Authority spokeswoman Barbara Martocci said.

LaCroix was injured Monday morning while unloading pipe for dredging machines at the TVA's Kingston Fossil Plant, she said.

The cleanup was temporarily halted so safety procedures could be reviewed with the hundreds of workers at the site. More than 5 million cubic yards of coal ash spilled into a river and lakeside homes near the plant on Dec. 22.

The U.S. Occupational Safety and Health Administration was notified and TVA officials promised a full investigation.

"We need to know what happened and why, as soon as possible, so that everyone touched by this accident can make the necessary changes to prevent a recurrence," Anda Ray, TVA's top environmental executive, said in a statement.