A British lawyer accused of helping a former Halliburton Co. subsidiary illegally bribe Nigerian officials to win more than $6 billion in construction contracts pleaded guilty Friday to federal charges and was ordered to forfeit nearly $150 million.

Jeffrey Tesler, 62, was charged with conspiracy and violating the Foreign Corrupt Practices Act, which among other things prohibits payments to foreign government officials to help obtain business. Tesler faces up to five years in prison on each count and up to $250,000 in fines when sentenced June 22. Nine other counts were dismissed under the plea deal.