Officer Convicted of Involuntary Manslaughter in 2009 Killing of Oscar Grant Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Wanda Johnson, the mother of Oscar J. Grant III, walks with supporters as they leave the Los Angeles Superior Court after the involuntary manslaughter verdict against former officer Johannes Mehserle. ( MARK RALSTON/AFP / Getty ) Produced by Arwa Gunja and Hsi-Chang Lin Produced by PRI and WNYC