Paul Selzer, the last remaining defendant in the federal government’s kickback case against Milberg, has pleaded guilty to filing false documents with the Internal Revenue Service.

The plea agreement ends an investigation spanning nearly a decade in which federal prosecutors alleged that Milberg and seven of its partners generated $251 million in attorney fees by paying kickbacks to lead plaintiffs. Last month, Milberg agreed to pay $75 million as part of a nonprosecution agreement with federal prosecutors. Several former partners, including co-founder Melvyn Weiss and William Lerach, have pleaded guilty in the case.