Dr. David Start shows how the fatal shot traveled through Michigan State Police Trooper Paul Butterfield IIhead during testimony at the trial of Eric Knysz before Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mich. on Tuesday, Feb. 25, 2014. Knysz, 20, is on trial on a first-degree murder charge in the killing of 43-year-old Trooper Paul Butterfield II during a traffic stop in September. (AP Photo/The Muskegon Chronicle, Ken Stevens) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT
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