Northwest Iowa cold case remains unsolved nearly 50 years later

Northwest Iowa cold case remains unsolved nearly 50 years later

SIOUX FALLS, S.D. (KELO) -- It's a murder mystery in Northwest Iowa that has gone unsolved for almost 50 years.We're talking about the death of Wilma Nissen, whose body was found in 1978 in a ditch just outside of Rock Rapids.There's a renewed effort in this cold case by her daughter and investigators to find answers, but more importantly, the cold-blooded killer. Click It or Ticket: Practicing safe driving as summer kicks off Krissi Atkis…