One of the first police shootings to be captured on cell phone, millions saw Bay Area Rapid Transit police Officer Johannes Mehserle fire a single, fatal gunshot into Oscar Grant's back as the 22-year-old lay face down on the train station platform. Now, a lawsuit filed by NPR member station KQED has forced BART to comply with California's 2019 police transparency law, and release never-before-heard tapes from inside that investigation.