Kizzee was riding his bike on Monday afternoon in Los Angeles County's Westmont neighborhood when two sheriff's deputies who had been driving by tried to stop him.
Prosecutors accuse Rittenhouse of firing an assault-style rifle at three protesters who tried to subdue him, killing 36-year-old Joseph Rosenbaum and Anthony Huber, 26.
"A teenage vigilante charged with killing two people, who had been protesting the police shooting of African American Jacob Blake in Kenosha, will remain in custody."