Lyle, 25, and Erik, 22, could be sentenced to die in California's gas chamber if convicted of first-degree murder in the Aug. 20, 1989, killings in the family's Beverly Hills home. They fired 15 blasts from two 12-gauge shotguns at their father, Jose Menendez, 45, an entertainment executive, and their mother, Kitty Menendez, 47, as the couple watched television in their den.