Many of you may be familiar with this case but it was new to me and I did not find a thread about it.
A husband and father of three, Elmer Crawford, murdered his entire family in their Glenroy, Australia home. After the murders, which included a homemade electrocution device, he staged a car accident scene 120 miles away in an attempt to frame his wife for murder/suicide. The car was intentionally driven off a cliff with his wife and children but did not plunge into the ocean as it is assumed Crawford intended. Instead, the car landed on a plateau and investigators were able to piece together what happened, even arriving at the original crime scene in the midst of Crawford's attempt to clean up. It is believed he fled out the back door as police were approaching his home.
Elmer Crawford then disappeared without a single credible trace in the 46 years since. A very large reward for information leading to his arrest offered in 2008 has gone unclaimed. It is a completely different type of vanishing more in line with the search for Mengele in South America than the typical cases of missing innocents.
Crawford would be 85 years old. Although it's quite possible he is deceased, the mystery can and should still be solved.