NEW YORK — New York state attorney General Dennis Vacco Tuesday amended his lawsuit against 20th Century Fox Film Corp., alleging the studio and others were part of a scheme to help murderer Sammy (the Bull) Gravano sidestep a law denying him profits from telling his life story.The lawsuit is an updated version of a complaint filed in the spring against Gravano, who has confessed to 19 murders, turned informant and may face wrongful death suits filed by families of the dead. The state is suing the film company and International Creative Management for participating in a scheme to circumvent the state’s “Son of Sam” law that allows the state Crime Victims Board to seize profits from crimes and potentially pass them on to crime victims. Gravano is the subject of Peter Maas’ bestselling book “Underboss” about his life of crime. The complaint contends that ICM negotiated the deal for the movie rights based upon “Underboss” for Maas’ and Gravano’s benefit. Maas also is named in the suit along with HarperCollins Publishers Inc., TJM Prods. Inc., the publisher of “Underboss” and Anthea Disney, CEO of HarperCollins. Gravano was the key federal witness against mob boss John Gotti.