Trayvon Martin’s killing in 2012 sparked a painful dialogue throughout the country and gave birth to the #BlackLivesMatter movement. And yet, on the eve of the anniversary of his death, the U.S. Justice Department announced that his killer, George Zimmerman, will not face federal criminal civil rights charges for killing the black teenager in Florida.

The case continues to resonate in the wake of other high-profile tragedies in the U.S. related to race and stereotyping. MSNBC’s Chris Hayes recently made this powerful statement after the shooting of three Muslim students in Chapel Hill, North Carolina:

“Like the killing of Trayvon Martin or Michael Brown, the senseless deaths of these three young people has struck such a profound nerve and mobilized so many because millions of people who look like those victims are fed up with the routine stereotyping, the marginalization in mainstream media representations and the vilification by political leaders seeking to score cheap political points.”

On the third anniversary of Trayvon Martin’s death, take a look at some of the conversations that have emerged from such tragedies:

A message from the mother of Oscar Grant, who was killed by a transit officer on January 1, 2009:

Our examination of how black murder victims are portrayed in the media:

Commentary from W. Kamau Bell on living as a black man in America:

50 years of black outrage in the U.S.: