Two men and a teenager were charged with murder and robbery in a mass shooting at Lincoln University in Chester County that left one person dead and six others -- including one of the suspects -- injured last October, officials announced. During a press conference on Tuesday, May 5, Chester County District Attorney Christopher de Barrena-Sarobe announced the arrests of William Sells, 20, of Wilmington, Karon Rollins, 17, of Wilmington, and Makaveli Valera, 19, of Bronx, New York.