John Knysz looks at the gun that was used in the killing of Michigan State Police Trooper Paul K. Butterfield II during the murder trial for his son, Eric Knysz, in Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mich. on Monday, Feb. 24, 2014. Eric Knysz is charged with murder in the shooting death of Michigan State Police Trooper Paul K. Butterfield II on Sept. 9, 2013 during a routine 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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