A major update in the investigation. Richard M. Allen has been arrested and charged with murder. Barbara, Andrew and Dan are in Delphi with what we know, what we don’t know and what comes next  To learn more about how HLN protects listener privacy, visit cnn.com/privacy

After Ron DeFeo Jr. finds his parents and younger siblings dead in their Amityville, New York, home, police begin to search for the killer. Host Donnie Wahlberg and local journalist Joel Martin revisit that horrific evening in 1974, the crime scene and the investigation — all in hopes of...