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Top BP official to take stand again at trial assessing responsibility for 2010 Gulf oil spill

  • Lamar McKay, former president of BP America and current chief executive of BP's Upstream unit, leaves Federal Court after testifying in New Orleans, Tuesday, Feb. 26, 2013. McKay, who was president of BP America at the time of the Deepwater Horizon disaster, became the first BP executive to testify at the federal trial intended to identify the causes of BP's Macondo well blowout and assign percentages of blame to the companies involved. (AP Photo/Gerald Herbert)

    Lamar McKay, former president of BP America and current chief executive of BP's Upstream unit, leaves Federal Court after testifying in New Orleans, Tuesday, Feb. 26, 2013. McKay, who was president of BP America at the time of the Deepwater Horizon disaster, became the first BP executive to testify at the federal trial intended to identify the causes of BP's Macondo well blowout and assign percentages of blame to the companies involved. (AP Photo/Gerald Herbert)  (The Associated Press)

  • Lamar McKay, former president of BP America and current chief executive of BP's Upstream unit, left, leaves Federal Court after testifying in New Orleans, Tuesday, Feb. 26, 2013. McKay, who was president of BP America at the time of the Deepwater Horizon disaster, became the first BP executive to testify at the federal trial intended to identify the causes of BP's Macondo well blowout and assign percentages of blame to the companies involved. (AP Photo/Gerald Herbert)

    Lamar McKay, former president of BP America and current chief executive of BP's Upstream unit, left, leaves Federal Court after testifying in New Orleans, Tuesday, Feb. 26, 2013. McKay, who was president of BP America at the time of the Deepwater Horizon disaster, became the first BP executive to testify at the federal trial intended to identify the causes of BP's Macondo well blowout and assign percentages of blame to the companies involved. (AP Photo/Gerald Herbert)  (The Associated Press)

  • CORRECTS DATE TO TUESDAY, FEB. 26 - Lamar McKay, former president of BP America and current chief executive of BP's Upstream unit, leaves Federal Court after testifying in New Orleans, Tuesday, Feb. 26, 2013. McKay, who was president of BP America at the time of the Deepwater Horizon disaster, became the first BP executive to testify at the federal trial intended to identify the causes of BP's Macondo well blowout and assign percentages of blame to the companies involved. (AP Photo/Gerald Herbert)

    CORRECTS DATE TO TUESDAY, FEB. 26 - Lamar McKay, former president of BP America and current chief executive of BP's Upstream unit, leaves Federal Court after testifying in New Orleans, Tuesday, Feb. 26, 2013. McKay, who was president of BP America at the time of the Deepwater Horizon disaster, became the first BP executive to testify at the federal trial intended to identify the causes of BP's Macondo well blowout and assign percentages of blame to the companies involved. (AP Photo/Gerald Herbert)  (The Associated Press)

The first BP executive to testify at a federal trial over the nation's worst oil spill will take the stand again Wednesday before a judge tasked with deciding whether the oil giant and other companies acted with gross negligence for the 2010 disaster in the Gulf of Mexico.

BP executive Lamar McKay testified Tuesday, the second day of the non-jury trial in New Orleans. He said BP and its contractors share responsibility for preventing blowouts like the one that triggered a rig explosion that killed 11 workers on April 20, 2010, spawning the vast spill.

Rig owner Transocean Ltd. and cement contractor Halliburton also are defendants at the trial, which opened Monday before U.S. District Judge Carl Barbier.