A 21-year-old Jasper County man was killed in a single-car crash over the weekend in Putnam County, according to Putnam County Sheriff Howard Sills.Jimmy Earnhardt Palmer leaves a large family mourning his death including his fiancé, Amber Freeman, and infant son, Kolson, both of Monticello; his mother, Amanda Palmer of Oxford; his father, Winston Palmer of Madison; numerous siblings including…