(Chisholm, MN)  --  Authorities have charged a 47-year old former police officer in a fatal shooting at a Chisholm sports bar last Saturday.  Jason Musburger of Chisholm faces a variety of charges after prosecutors say he confronted his ex-wife in the bar, left, then returned with a gun, shooting three men before being hit in the head with a chair by another patron.  Forty-year old Edward Walberg died during the incident.  Musberger, who is being held on two-million-dollars bail, worked with the Chisholm Police Department in the 1980s before moving on to the city's water department.