When James Edsel Tucker was fatally stabbed at a Winnipeg apartment early Thursday, it was the end of a dark era in Manitoba history, one the 45-year-old had apparently tried to distance himself from by changing his name.    Police confirmed that Tucker was previously known as William James Harcus, whom an expert on racist groups said was the former head of the Manitoba Ku Klux Klan and a defendant in a high profile Winnipeg hate crimes trial.     Winnipeg murder victim turns out to be ex-head of Manitoba KKK | National Post