CNN looked into the 1957 kidnapping and murder of Maria Ridulph, which went unsolved for half a century. The five-part series found that the suspect was interviewed and discounted during the early days of the investigation, as the FBI took over the case. His parents helped him establish an alibi, and his mother supposedly exposed his secret on her death bed. A sister launched the investigation that resulted in the arrest and conviction of Jack McCullough, who maintains his innocence to this day. McCullough was convicted after a four-day trial on what appeared to be thin evidence resulting from questionable legal rulings by an inexperienced judge. The most compelling evidence is the testimony of the eyewitness, who was 8 years old at the time and is now in her 60s. She says she is certain, and she appears to be a credible witness.