On June 17, a white man named Dylann Roof killed nine people at a historically black church in Charleston, SC, in what has been declared a racially motivated hate crime. Roof was arrested and taken into custody earlier today. The unfathomable massacre sparked outrage and deep sadness throghout the country. Following on the heels of the deaths of Freddie Gray and Kalief Browder, Wednesday's events make it extremely difficult to identify progress or remain hopeful about the state of race relations in the U.S. As many attempt to wrap their heads around the tragic events, celebrities add their voice to the conversation. From Solange Knowles to the ever-eloquent Jesse Williams, actors, musicians and activists alike are sharing their thoughts on social media.