People stage a “die-in” in the middle of the road after carrying coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A girl runs past coffins to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A woman moves cardboard coffins blocking the door of the LA County Board of Supervisors' office as she tries to exit after a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People stage a “die-in” in the middle of the road after carrying coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

The five-year-old daughter of Jose de la Trinidad, 36, who was fatally shot by Los Angeles County sheriff's deputies, looks at cardboard coffins to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

LA sheriff's deputies look out of the LA County Board of Supervisors' office where cardboard coffins were leant to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People stage a “die-in” in the middle of the road after carrying cutouts of coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People protest outside the LA County Board of Supervisors' office with cardboard coffins to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A woman walks through a field of cardboard coffins to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People stage a “die-in” in the middle of the road after carrying cutouts of coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A woman lays cardboard coffins in the middle of the raod during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

The family of Jose de la Trinidad, 36, who was fatally shot by Los Angeles County sheriff's deputies, stand outside the LA County Board of Supervisors' office where cardboard coffins were leant to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People carry cutouts of coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People carry cutouts of coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A girl arranges cutouts of coffins to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A woman lays a cardboard coffin in the middle of the road during a march to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People stage a “die-in” in the middle of the road after carrying cutouts of coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

Cardboard coffins lay in the middle of the road during a march to commemorate the more than 617 people march organizers say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People carry cutouts of coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A protester pauses by a glass memorial on the spot where Charly Leundeu Keunang, 43, was shot by police on skid row, during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

People carry coffins during a march to commemorate the more than 617 people they say have been killed by law enforcement in LA County since 2000, in Los Angeles, California April 7, 2015. (Photo by Lucy Nicholson/Reuters)

A protester carries a sign with an image of Trayvon Martin at a rally in North Charleston, South Carolina April 8, 2015. Demonstrators rallied on Wednesday against what they described as a culture of police brutality in South Carolina in the case of white officer Michael Slager, who was caught on video killing 50-year-old Walter Scott, a black man, by shooting him in the back as Scott ran away after a traffic stop. Slager was charged on Tuesday with murder in the death of Scott. (Photo by Randall Hill/Reuters)

Protesters carry a sign with an image of Trayvon Martin at a rally in North Charleston, South Carolina April 8, 2015. (Photo by Randall Hill/Reuters)

Rev. Arthur Prioleau of Goose Creek, South Carolina, carries a sign at a rally in North Charleston, South Carolina April 8, 2015. (Photo by Randall Hill/Reuters)

Protesters carry signs at a rally in North Charleston, South Carolina April 8, 2015. (Photo by Randall Hill/Reuters)

A police officer watches protestors at a rally in North Charleston, South Carolina April 8, 2015. (Photo by Randall Hill/Reuters)

Muhiydin Moye D'Baha of the Black Lives Matter movement leads the protest at a rally in North Charleston, South Carolina April 8, 2015. (Photo by Randall Hill/Reuters)

Jerome Taylor of North Charleston, South Carolina holds signs at a rally in North Charleston, South Carolina April 8, 2015. (Photo by Randall Hill/Reuters)