Share This StorySean Cahill, the son of retired Hennepin County Judge Peter Cahill, has been appointed by Gov. Tim Walz to fill a judicial vacancy in Hennepin County. Cahill’s father was famously the judge who presided over the criminal trial of Derek Chauvin in Minnesota. “Sean Cahill brings experience from every corner of the Hennepin County justice system,” Walz said in a Friday statement. “Not only has he been a thoughtful and fair prosecuto…