In December 2003 , 26 - year - old drug addict David Parfitt was convicted of PC Walker 's manslaughter .
In December 2003 , 26 - year - old drug addict David Parfitt was sentenced to thirteen years in prison .
In December 2003 , 26 - year - old drug addict David Parfitt was convicted of PC Walker 's manslaughter and sentenced to thirteen years in prison .