Halliburton destroyed computer tests after Halliburton , prosecutors say . Prosecutors charge a company manager as the company pleads guilty . The Deepwater Horizon blowout killed 21 and unleashed the worst Louisiana oil spill . A federal report in 2011 concluded that BP , Halliburton and Transocean all violated federal offshore safety regulations and shared responsibility for the disaster . Well owner Halliburton and Deepwater Horizon are still battling over the disaster in court .
Halliburton destroyed computer tests after Halliburton , prosecutors say . Prosecutors charge a company manager as the company pleads guilty . The Deepwater Horizon blowout killed 21 and unleashed the worst Louisiana oil spill . Well owner Halliburton and Deepwater Horizon are still battling over the disaster in court .