Nicholas Chesser was sentenced on Tuesday to 20 years for a DUI manslaughter that took the lives of two Santa Rosa Beach residents in April of 2007. Chesser was found guilty following a trial in November in Walton County. Chesser’s vehicle reportedly crossed the paved center turn lane and struck a Mazda minivan driven by Roberta Mahaffey, 72, who died at the scene. Her husband, Ernest Mahaffey, 75, died several hours later at Sacred Heart Hospital in Pensacola. Chesser, 19 at the time of the accident, was seriously injured.