Two brothers arrested in the 1989 shotgun slayings of their mother and video executive father in their Beverly Hills mansion were indicted by a county grand jury, lawyers said Tuesday.Lyle and Erik Menendez were scheduled to be arraigned Dec. 29 on the charges contained in the sealed indictment. They originally were charged in a criminal complaint with murder and have been jailed without bail. Charged in 1989 Lyle, 24, and Erik Menendez, 22, were charged in the Aug. 20, 1989, killings of Jose Menendez, 45, chairman and CEO of Live Entertainment Inc., and Mary Louise (Kitty) Menendez, 44. The couple were gunned down at close range while watching TV in the den of their $ 4 million home. Investigators speculated the brothers killed their parents because they hated their father, a Cuban-born, self-made millionaire who was described as domineering toward them. They also stood to inherit millions of dollars, investigators said. The charges in an indictment replace the criminal complaint filed by prosecutors in March 1990. “We thought the indictment would be a lot quicker than taking it through a preliminary hearing,” said Deputy District Attorney Les Kuriyama. Sealed transcript requested Defense attorneys Leslie Abramson and Jill Lansing requested that the grand jury transcript be sealed until the case is completed. Superior Court Judge Lance Ito will hear arguments on the matter Dec. 29.