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A former manager at Texas-based Halliburton admitted destroying evidence from the Deepwater Horizon explosion and resulting  2010 Gulf of Mexico oil spill, the biggest offshore spill in U.S. history.

Anthony Badalamenti, 62, of Katy, Texas, faces a maximum sentence of one year in prison and a $100,000 fine after his guilty plea in U.S. District Court in New Orleans to one misdemeanor count of destruction of evidence.

He’s scheduled to be sentenced by U.S. District Judge Jay Zainey on January 21.

The explosion of the Deepwater Horizon rig killed 11 people.

Halliburton pleaded guilty in September to destroying evidence following the disaster.

BP and rig operator Transocean also pleaded guilty to charges related to the disaster.

Halliburton was BP’s cement contractor on the semi-submersible drill rig that exploded.

Badalamenti was the cementing technology director for Halliburton. He was accused of ordering a program manager to delete computer records.

The program manager told prosecutors he followed orders despite feeling uncomfortable.