a former fortune 500 executive from new hampshire will serve between nine and 20 years in prison for causing a highway crash that killed a vermont couple and their unborn baby .
robert dellinger , 54 , was sentenced on thursday to two four-and-a-half to ten year sentences that are to be served consecutively in the december 2013 deaths of amanda murphy , 24 , who was 8 months pregnant , and her fiance , 29-year-old jason timmons .
prosecution claimed he deliberately drove his vehicle head-on into the couple 's car because he was depressed and wanted to kill himself .