Gannon’s announcement harkened back to the 2009 New Year’s Day shooting of Oscar Grant, one of the original cases that began the Black Lives Matter movement. Grant, 22, was killed by BART officers after detaining Grant and several other passengers on the platform after reports of a fight broke out. After Grant’s death, Johannes Mehserle, the officer who fatally shot him in the back, claimed he grabbed his gun instead of his taser.