Middleton Dunmore, of Atlantic City, claimed he had ineffective legal representation when he pleaded guilty in 2006.
Dunmore got 20 years for robbing a convenience store in Dennis Township and another 10 years for manslaughter in the death of 32-year-old trooper Beteram Zimmerman III.
Zimmerman died in February of 2004 when his cruiser struck a utility pole while responding to the robbery call.
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