NEWYou can now listen to Fox News articles! The Minneapolis church shooter who killed two children and wounded 21 others during a Catholic school Mass bought a firearm four days beforehand, according to a local gun shop owner.Robin Westman opened fire on a school-wide Mass at Annunciation Catholic Church on Aug. 27 at around 8:30 a.m., shooting from outside the building through the stained-glass windows.Westman, 23, died by suicide from a self-inflicted gunshot. Westman, who was born Robert Paul Westman and underwent a legal name change in...