Mother of slain California boys speaks out as convicted killer drags out case in court: 'She's a murderer'

Two Los Angeles mothers are at odds on opposite sides of California's embattled criminal justice system: one grieving the loss of her two sons and the other trying to get her conviction for killing them overturned.

Rebecca Grossman, a rich and powerful Los Angeles socialite, sped her Mercedes through a crosswalk and killed Mark Iskander, 11, and his 8-year-old brother, Jacob, as they were crossing the street with their mother and younger brother.

Nancy Iskander, a biotech executive...