Erika Kirk, the wife of the late Charlie Kirk, vowed Friday to continue her husband’s conservative movement.

In her first public appearance since her husband was fatally shot Wednesday, she said, “The cries of this widow will echo around the world like a battle cry.”

Kirk was killed Wednesday while speaking with students at Utah Valley University, in Orem, Utah.

“The evil-doers for my husband’s assassination have no idea what they have done,” Erika Kirk said in a livestream on the YouTube page of Turning Point USA, the conservative movement her husband started out of high school.

Tyler Robinson, 22, of Utah, was taken into custody after a family member contacted a family friend, who then informed authorities that Robinson had confessed to them or implied that he committed the killing, according to USA Today.