The man convicted in a school killing in Alberta has walked away from an open custody facility in Toronto, prompting a police manhunt. Police said Todd Cameron Smith left the custody facility without escort or permission. In April 1999, the then-14-year-old Smith sawed off his stepfather's rifle and gunned down 17-year-old Jason Lang at W.R. Myers High School in the southern Alberta community of Taber. He had intended to kill everyone at the school. The killing sent shockwaves across Canada, coming one week after two youths shot and killed 13 people at Columbine High School in Littleton, Colorado. Smith was...