NEW ORLEANS — Former New Orleans Saints player Darren Sharper pleaded guilty Monday to rape in Louisiana, completing a series of pleas in four states that will see him serve at least nine years in prison for drugging and sexually assaulting women.

Sharper entered his plea — guilty to two counts of forcible rape and one count of simple rape —in a Louisiana state court in New Orleans, a short drive from the federal court where he pleaded guilty last month.

He could serve as much as 20 years under terms of a lengthy memorandum read in court Monday by state District Judge Karen Herman. However, he will probably serve only about another nine years, mostly in federal custody, if he complies with all the terms of that pact.

Those terms include Sharper’s help with investigations of two co-defendants in the Louisiana cases and a long list of requirements he will have to meet after his release.