Three teens arrested in the beating death of a Chicago honor student have been formally indicted on first-degree murder charges.

The formal charges were filed Friday against 19-year-old Silvonus Shannon, 18-year-old Eugene Riley and 16-year-old Eric Carson,

Prosecutors claim they killed 16-year-old Derrion Albert on Sept. 24 during a melee captured on cell phone video. It shows Albert being struck with boards and kicked as he lay on a sidewalk.

Police have described the sophomore at Christian Fenger Academy High School as an innocent bystander caught up in a fight.

The teens are being held without bail. The judge Friday set their arraignment for Nov. 10.

Prosecutors dropped charges against a fourth teen earlier this week.