Actress Isabel Sanford, best known as “Weezie,” Louise Jefferson on the television sitcom “The Jeffersons,” died of natural causes, her publicist said Monday. She was 86. Sanford died Friday at Cedars-Sinai Medical Center, where she had been hospitalized since July 4, said Brad Lemack. Her daughter, Pamela Ruff, was at her side, he said. Her health had waned after undergoing preventive surgery on a neck artery 10 months ago, Lemack said. He did not give a cause of death. Sanford co-starred with Sherman Hemsley from 1975 to 1985 on CBS’ “The Jeffersons,” a spin-off of the popular series “All in the Family,” in which she also appeared. She appeared on The Simpsons earlier this year as herself in the episode Milhouse Doesn’t Live Anymore, as an episode narrator and tourguide at the museum of television.