In Black Life Matter, Biko Mandela Gray offers a philosophical eulogy for Aiyana Stanley-Jones, Tamir Rice, Alton Sterling, and Sandra Bland that attests to their irreducible significance in the face of unremitting police brutality. Gray employs a theoretical method he calls "sitting-with"--a philosophical practice of care that seeks to defend the dead and the living. He shows that the police who killed Stanley-Jones and Rice reduced them to their bodies in ways that turn black lives into tools that the state uses to justify its violence and existence. He outlines how Bland's arrest and death reveal the affective resonances of blackness, and he contends that Sterling's physical movement and speech before he was killed point to black flesh as unruly living matter that exceeds the constraints of the black body. These four black lives, Gray demonstrates, were more than the brutal violence enacted against them; they speak to a mode of life that cannot be fully captured by the brutal logics of antiblackness.