Whether these three women were murdered or perished in a boating accident, I feel that the key person of interest would be the Tri Hull driver.
He may have owned, rented, borrowed, or even stolen the boat. Checking out reports of missing boats would have been a good idea.
As one can see by looking at the index of various Missing Persons sites, there are fewer listed cases for each year, as you look back in time. This does not mean that people were not reported as missing at the time, but that fewer of those cases have made it to the internet websites.
Perhaps scanning on the Social Security Death index for dates of death on or shortly after 2 July 1966 would develop some possibilities for further research. For instance, perhaps the driver of the Tri Hull runabout died in a mishap and only his body was found... Probably a long shot, but a possibility.
He may have owned, rented, borrowed, or even stolen the boat. Checking out reports of missing boats would have been a good idea.
As one can see by looking at the index of various Missing Persons sites, there are fewer listed cases for each year, as you look back in time. This does not mean that people were not reported as missing at the time, but that fewer of those cases have made it to the internet websites.
Perhaps scanning on the Social Security Death index for dates of death on or shortly after 2 July 1966 would develop some possibilities for further research. For instance, perhaps the driver of the Tri Hull runabout died in a mishap and only his body was found... Probably a long shot, but a possibility.