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Sybrina Fulton was thrust into the national spotlight more than a decade ago for the worst possible reason: her son, Trayvon Martin\u2014an unarmed teen-age boy returning from the store\u2014was shot. Her son\u2019s body was tested for drugs and alcohol, but not the self-appointed neighborhood watchman, George Zimmerman, who killed him, claimed self-defense, and was acquitted. \u201cTrayvon Martin could have been anybody\u2019s son at seventeen,\u201d Fulton tells David Remnick. He was an affectionate \u201cmama\u2019s boy\u201d who wound up inspiring a landmark civil-rights movement: Black Lives Matter. B.L.M. became a cultural touchstone and a political lightning rod, but all its efforts can\u2019t make Fulton whole again. \u201cI think I\u2019m going to be recovering from his death the rest of my life,\u201d she says. \u201cIt\u2019s so unnatural to bury a child,\u201d she says. Fulton has become an activist and founded Circle of Mothers, which hosts a gathering for mothers who have lost children or other family members to gun violence.