On a hot summer day in August 2014, a Ferguson, Missouri, woman learned that her unarmed 18-year-old son had been shot and killed by a white police officer. The incident highlighted the racial tensions between police and African Americans across the county and catapulted the Black Lives Matter movement into the national spotlight. And since then, Lezley McSpadden, Michael Brown's mother, has used her platform of grief to condemn the extrajudicial killing of black men, women, and children by law enforcement officials. As a speaker at this week's Democratic National Convention, she'll bring her message to the political stage once more.

During his speech at the Republican National Convention last week, the GOP's presidential nominee, Donald Trump, did not mention the Black Lives Matter movement at all, even after video footage of two police shooting deaths of black men went viral earlier this month. The deaths of Alton Sterling and Philando Castile were catalysts for a new surge of peaceful protests nationwide as well as the ensuing, tragic shooting deaths of police officers in Dallas and Baton Rouge. Race relations and policing is a vital issue the next president will have to address, and so Hillary Clinton invited McSpadden, as well as other "Mothers of the Movement" to speak during day two of the DNC.

The officer who shot Michael Brown that day claimed that the teenager had both charged him and attempted to grab his gun during a confrontation, and a grand jury later declined to indict him. Lezley McSpadden maintains that her college-bound son should not have died the way he did, and since his death she's been a regular presence in the news and advocacy circuits, keeping Brown's memory alive.

In additional to appearing at other Hillary Clinton campaign events, McSpadden also spoke before a United Nations committee at a human rights conference in Switzerland and has filed a wrongful death lawsuit lawsuit against Wilson, the city of Ferguson and former police chief Thomas Jackson. McSpadden has publicly pushed for a bill that would require police officers in Missouri to wear body cameras at all times. In April, she memorialized her son in a powerful scene in Beyoncé's visual album Lemonade, and her memoir, Tell the Truth & Shame the Devil, which chronicles Brown's life, too, came out in May.

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WASHINGTON, DC - DECEMBER 13: Lesley McSpadden, mother of police shooting victim Michael Brown helps lead the 'Justice For All' rally and march against police brutality and the killing of unarmed black men by police in the nation's capital, December 13, 2014 in Washington, DC. Organized by Rev. Al Sharpton's National Action Network, this march and others like it across the country aim to tell Congress and the country that demonstrators will not stand down until there is systemic change, accountability and justice in cases of police misconduct. Sharpton said the demonstration is happening in Washington 'because all over the country we all need to come together and demand this Congress deal with the issues, that we need laws to protect the citizens in these states from these state grand jurors.' (Photo by Chip Somodevilla/Getty Images)

In her work to establish a better relationship between black Americans in law enforcement, McSpadden has also founded the Michael O.D. Brown We Love Our Sons And Daughters Foundation, which also aims to improve health outcomes, advance education, and strengthen families in African American communities.

"I just don't look at myself as being an activist or any of those things people try to label me as," McSpadden told the Associated Press. "I've always just wanted to be treated fair and equal, and that's what I'm fighting for for my son right now."

And even though McSpadden is an outspoken defender of many African Americans who have died during confrontations with police since her son did, McSpadden's main goal is to remind the world that Brown was a person who mattered. In an August 2015 interview with Al Jazeera America, she described him to anchor Tony Harris:

Michael was definitely a leader. He was a big brother, so he was a protector. He was the first grandson, so he was a provider to elderly people that needed help across the street, bringing in their groceries, very respectable. He also was a first nephew for his aunts and uncle, so any kids that they had, he was like the big brother role model. He was the role model.

In a New York Times op-ed after Sterling and Castile died, she wrote a simple message to their families: "When you’re ready, and if you need me, I’ll be there for you." Speaking at the DNC — among a lineup of other devastated mothers – will offer McSpadden the opportunity to continue this work and support others in similar, heartbreaking situations.