Classes were canceled and a vigil was scheduled Tuesday at Delta State University after a geography teacher's shooting spree left three people dead including a "star" of the Mississippi school's faculty.<br />Authorities were trying to determine why Shannon Lamb, 45, apparently shot his live-in girlfriend in Gautier, Miss., early Monday, then drove 300 miles before confronting and killing an assistant history professor on the university's campus in Cleveland.<br />Hours later, after being pursued by police, Lamb fatally shot himself, police said.<br />Lamb's death ended a harrowing day of lockdowns, SWAT teams and building-by-building searches at the 3,500-student campus.
