Lauren McFarlane , 18 , was shot by an unknown assailant . Her death came hours after Obama spoke on the violence . McFarlane 's younger sister was in a high school group standing near the president . Obama cited gun violence that killed 443 people in the city last year as one reason why children need community wide support to help them believe they can improve their lives through education and hard work . Hours later , the crowd that Obama addressed took another young life .
Lauren McFarlane , 18 , was shot by an unknown assailant . Her death came hours after Obama spoke on the violence . McFarlane 's younger sister was in a high school group standing near the president . Hours later , the crowd that Obama addressed took another young life .