CNN student accused of killing about 30 schoolmates at party . ( CNN ) -- Rick Hanson , son of a police officer , is charged with first -degree murder . The killings are `` the worst mass murder in Calgary 's history , '' police chief says .
CNN student accused of killing about 30 schoolmates at party . Rick Hanson , son of a police officer , is charged with first -degree murder . The killings are `` the worst mass murder in Calgary 's history , '' police chief says .