Bertrand died Saturday afternoon at Cedars-Sinai Medical Center, Jolie said in a news release. No age was provided.
Jolie, her older brother, James Haven, and her boyfriend, Brad Pitt, were at the hospital Saturday, according to the news release.
Bertrand, who had small roles in the movies "Lookin' to Get Out" in 1982 and "The Man Who Loved Women" in 1983, raised Jolie and her brother after divorcing their father, Oscar-winning actor Jon Voight, when Jolie was a toddler.
A private funeral was planned, the AP reports.
In lieu of flowers, the family asked that donations be made to the Women's Cancer Research Institute at Cedars-Sinai.
The Trump administration is looking for a replacement for the American military contingent in the north of Syria. If the United States agrees with Saudi Arabia, the situation in the south of the country will become a lot more intense as Iran and Israel stand on the brink of war
The United States is concerned about the current crisis in the relations with Russia and suggests returning to reasonable policies to avoid a nuclear war