In 1982, Norma Richards and her two young daughters were brutally murdered. Then, 27 years later, an unlikely source got the case reopened and eventually solved.

When DiAnne Keidel went missing in September 1966, it was just the start of a tragic series of events for her family. Sources: https://pastebin.com/fb4QTheD

These two cold cases were solved thanks to a major change in the law, and family members dedicated to making sure the killers faced justice.