Eric Knysz
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Eric Knysz leaves the courtroom following his sentencing on Tuesday, April 8, 2014. Knysz was sentenced to life in prison by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on February 25, 2014 of killing Michigan State Police Trooper Paul K. Butterfield II during a routine traffic stop on September 9, 2013 in rural Mason County. Mason County Sheriff Office Sgt. Bethany Carrier is pictured behind Knysz and his father, John Knysz is pictured in the background left. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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Eric Knysz is pictured with his attorney David Glancy during during his sentencing on Tuesday, April 8, 2014. Knysz was sentenced to life in prison by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on February 25, 2014 of killing Michigan State Police Trooper Paul K. Butterfield II during a routine traffic stop on September 9, 2013 in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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Eric Knysz is pictured during his sentencing on Tuesday, April 8, 2014. Knysz was sentenced to life in prison by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on February 25, 2014 of killing Michigan State Police Trooper Paul K. Butterfield II during a routine traffic stop on September 9, 2013 in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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Eric Knysz reads a statement during his sentencing on Tuesday, April 8, 2014. He was sentenced to life in prison with no chance of parole by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on Feb. 25, 2014 of killing Michigan State Police Trooper Paul K. Butterfield II during a routine traffic stop on September 9, 2013 in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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Paul T. Butterfield, the father of slain Michigan State Police Trooper Paul K. Butterfield II reads a statement in court during the sentencing of Eric Knysz on April 8, 2014. His wife Pat Butterfield is standing next to him. Knysz was sentenced to life in prison with no chance of parole by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on February 25, 2014 of killing Butterfield during a routine traffic stop on September 9, 2013 in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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From left, Paul T. Butterfield, the father of slain Michigan State Police Trooper Paul K. Butterfield II, his wife Pat Butterfield, and Butterfield's fiancee Jennifer Sielski listen as Eric Knysz reads a statement in court during his sentencing on Tuesday, April 8, 2014. Knysz was sentenced to life in prison with no chance of parole by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on February 25, 2014 of killing Butterfield during a routine traffic stop on September 9, 2013 in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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Jennifer Sielski, fiancee of slain Michigan State Police Trooper Paul K. Butterfield II hugs Mason County Prosecutor Paul Spaniola in court following the sentencing of Eric Knysz on Tuesday, April 8, 2014. Knysz was sentenced to life in prison with no chance of parole by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on February 25, 2014 of killing Butterfield II during a routine traffic stop on September 9, 2013 in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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Jennifer Sielski, fiancee of slain Michigan State Police Trooper Paul K. Butterfield II makes a statement in court during the sentencing of Eric Knysz on Tuesday, April 8, 2014. Her father, Paul Sielski stands next to her. Knysz was sentenced to life in prison with no chance of parole by Mason County's 51st Circuit Court Judge Richard I. Cooper in Ludington, Mo. Knysz was convicted on Feb. 25, 2014 of killing Michigan State Police Trooper Paul K. Butterfield II during a routine traffic stop on September 9, 2013 in rural Mason County. (AP Photo/The Muskegon Chronicle, Ken Stevens)

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Jennifer Sielski, fiancee of slain Michigan State Police Trooper Paul K. Butterfield II embraces Mason County Prosecutor Paul Spaniola after a jury convicted Eric Knysz of first-degree murder in the killing of Butterfield Tuesday, Feb. 25, 2014, in Ludington, Mich. Knysz, 20, of Irons, Mich., was on trial in the September shooting of the 43-year-old state trooper. (AP Photo/The Muskegon Chronicle, Ken Stevens) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT.

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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