George Zimmerman to auction off gun he used to kill Trayvon Martin George Zimmerman shot and killed 17-year-old Trayvon Martin on February 26, 2012. Zimmerman was charged with second-degree murder and manslaughter, then acquitted by a Florida jury on July 13, 2013. The case sparked a nationwide debate and protests over "stand your ground" laws and race relations in the United States.May 12, 2016