One of the nation’s most prominent conservative activists is dead after being shot during an event. Charlie Kirk, the head of the conservative youth organization Turning Point USA, was killed while speaking at Utah Valley University.

In the last decade, Kirk grew as an influential political figure online and organized events on campuses for conservative causes. Lisa Desjardins reports what we know so far, and Geoff Bennett discusses Kirk's influence with Semafor's David Weigel.