MADISON, Wisconsin, July 26 -- The office of the U.S. Attorney for the Western District of Wisconsin issued the following news release: Timothy M. O'Shea, United States Attorney for the Western District of Wisconsin, announced that Yoshi R. Walker, 26, New Brighton, Minnesota, was sentenced yesterday by Chief U.S. District Judge James D. Peterson to 6 years in federal prison for attempting to distribute 40 grams or more of fentanyl. The prison term will be followed by 3 years of supervised rele  more