Accused serial rapist Joseph Brooks committed suicide — but that didn’t stop a Manhattan prosecutor yesterday from claiming the Oscar winner’s selfish act should mean a forfeit of the $1.25 million bail he posted.

Assistant District Attorney Maxine Rosenthal argued that Brooks’ Sunday departure from the case — via a mail-order “suicide kit” complete with plastic bag and helium tank in his Upper East Side apartment — was voluntary and, therefore, his estate should forfeit the money.

“The defendant did absent himself from the case,” Rosenthal told Manhattan Supreme Court Justice Charles Solomon.

The judge disagreed, ordering the bail be returned, as is customary in cases abated by the defendant’s death.

The prosecutor next set her sights on Brooks’ co-defendant — Shawni Lucier, his assistant and “procurer” — announcing that no plea bargain would be offered and that she would recommend some jail time.