While Martin Luther King III paid tribute to his father’s legacy at the March on Washington 50th Anniversary Saturday, he said the Trayvon Martin killing demonstrates that America has more work ahead before racial equality is reached.

“The task is not done, the journey is not complete,” he said. “The vision preached by my father a half-century ago was that his four little children would no longer live in a nation where they would judged by the color of their skin but by the content of their character.”

“However, sadly, the tears of Trayvon Martin’s mother and father remind us that, far too frequently, the color of one’s skin remains a license to profile, to arrest and to even murder with no regard for the content of one’s character,” he said, calling for the repeal of “stand your ground” self-defense laws, CBS News reports.

Martin Luther King III: Trayvon Martin Killing Shows That Skin Color Remains a License to Profile, to Arrest and to Even Murder

Martin Luther King III speaks during an event to commemorate the 50th anniversary of the 1963 March on Washington at the Lincoln Memorial, Saturday, Aug. 24, 2013, in Washington. (Credit: AP)

Martin’s parents attended the march; his mother, Sybrina Fulton, briefly addressed the crowd.

King also slammed the Supreme Court for having “eviscerated” voting rights protections, calling for citizens to “fight back boldly” to restore those rights, CBS News said.

The event—sponsored by King, the NAACP, and Rev. Al Sharpton’s National Action Network—also featured speeches by Sharpton, Attorney General Eric Holder, Newark Mayor Cory Booker, and Rep. John Lewis, D-Ga. They spoke from the steps of the Lincoln Memorial, where 50 years ago this month King delivered his famous “I Have a Dream” speech, CBS News said.

Here’s a clip of Martin Luther King III’s remarks:

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