COPS SAY a Northwest Indiana man murdered pretty Amanda Bach who had been missing since last Thursday and was found dead Saturday--300 yards from the accused killer's home. Dustin McCowan, 18, then allegedly shot to death his former girlfriend, Bach, 19. He has been charged with murder.Bach left her Portage, Indiana home at 10 p.m. Thursday to go see McCowan, and police found her gold Pontiac around 3:30 a.m. Friday at a general store. Detectives say the bubbly brunette had sustained trauma. McCowan was arrested at Indiana University in
