NEW YORK (AP).- It’s a role that moviegoers might not know Robert De Niro plays: overseeing his painter father’s estate. The Academy Award-winning actor served as a star witness Friday in an art-fraud trial, testifying against a former gallery director accused of selling some of the late Robert De Niro Sr.’s works without paying his family its share. Seeming as self-assured on the witness stand as his characters are on screen, De Niro told jurors about his family’s dealings with the now-shuttered Salander-O’Reilly Galleries LLC, giving detailed answers and drawing laughs at times from a courtroom packed with reporters and onlookers. But overall, he told a story of coming to doubt an art dealer he’d trusted and considered a friend. “I wasn’t watching as carefully as I probably should have” early in the estate’s involvement with gallery owner Lawrence Salander,” De Niro said. But “I trusted Larry implicitly. I thought that anything that he did, it was going to be good.