UPDATED 23:15 PM EST, February 26, 2013
Lamar McKay, who was president of BP America at the time of the Deepwater Horizon disaster, became the first BP executive to testify at a federal trial intended to identify the causes of BP's Macondo well blowout and assign percentages of blame to the companies involved.
Rig owner Transocean and cement contractor Halliburton also are defendants at trial, which opened Monday.
