Paul Butterfield, standing background, the father of slain Michigan State Police Trooper Paul Butterfield II stands during a break in the murder trial of Eric Knysz, seated foreground, on Tuesday, Feb. 25, 2014, in Ludington, Mich. Butterfield is wearing a mask to protect himself as he fights leukemia. Knysz is charged in the September 2013 shooting death of the state trooper during a traffic stop in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT.
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