FILE - In this April 21, 2010 file image provided by the U.S. Coast Guard, fire boat response crews battle the blazing remnants of the off shore oil rig Deepwater Horizon. British oil company BP said Thursday Nov. 15, 2012 it is in advanced talks with U.S. agencies about settling criminal and other claims from the Gulf of Mexico well blowout two years ago. In a statement, BP said "no final agreement has yet been reached" and that any such deal would still be subject to court approvals. (AP Photo/US Coast Guard, File)

BP said Thursday that it will pay $4.5 billion in a settlement with the U.S. government over the disastrous 2010 oil spill in the Gulf of Mexico and plead guilty to criminal charges related to the deaths of 11 workers and lying to Congress.

The day of reckoning comes more than two years after the nation's worst offshore oil spill. The figure includes nearly $1.3 billion in criminal fines — the biggest criminal penalty in U.S. history — along with payments to certain government entities.

A person familiar with the settlement said two BP employees will also face manslaughter charges over the 11 deaths in the oil-rig explosion that triggered the spill. The person was not authorized to discuss the matter on the record and spoke on condition of anonymity.

Up to now, the only person charged in the disaster was a former BP engineer who was arrested in April on obstruction of justice charges. He was accused of deleting text messages about the company's response to the spill.

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