State police Col. Kerry Gilpin says justice in her late sister’s three decade-old murder is “within reach” after a North Carolina man was arrested in the 1986 slaying of the teenage girl from Kingston.Michael Arthur Hand, 61, of Troutman, N.C., is in custody in North Carolina pending a court appearance today linked to the slaying of 15-year-old Tracy Gilpin of Kingston, authorities said.Hand, who is in the custody of the Iredell County Sheriff’s Office, lived in Kingston at the time of the homicide, a police source confirmed.