The revelation comes from documents in a civil suit over former Ferguson police officer Darren Wilson's killing of the unarmed teenager.
The previously unseen video suggests that there might be more to the robbery than initially presented by Ferguson police.
Both candidates are talking tough—one literally shoots a machine gun in his TV ads—two years after Michael Brown was gunned down by Officer Darren Wilson.
Darren Seals, a prominent figure during the protests in Ferguson, was reportedly found inside a charred vehicle north of St. Louis.
The US Department of Justice, for the first time, will keep a comprehensive database of fatal officer-involved incidents, amid rising skepticism around police accountability.
Before Michael Brown's death became an urgent call to action, Lezley McSpadden strove to provide stability and safety for her son in a hostile world.
Comey doubled down on his earlier claims that the videotaping of officers is hindering their ability to police communities and prevent crime.
Missouri lawmakers have approved a bill that blocks the release of footage from officer-mounted cameras until after an investigation is complete.