SummaryShooting among the deadliest in Canadian history Police revise death toll down to 9, including shooter, from 10 Police say suspect acted alone OTTAWA, Feb 11 (Reuters) - The suspect in a deadly school shooting in western Canada was an 18-year-old woman with mental health issues who killed her mother and stepbrother before attacking her former school, police said on Wednesday, but investigators did not offer a motive for one of the worst mass slaughters in Canadian history. The killer, whom police identified as Jesse Van Rootselaar, died by suicide after the shooting on Tuesday in Tumbler Ridge, a remote...