Arrest made in 1980 St. Clair County cold case murder.Detectives cite advancements in DNA testing December 18th, 2023 PORT HURON, Mich. – After more than 40 years, a murder case in St. Clair County might finally be closed. The St. Clair County Sheriff's Office said it made an arrest last week in a murder case that has been unsolved since 1980. Dete...