Most investigators consider the last canonical murder to have been in 1938.
But the official said investigators consider that a distinct possibility.
Officials said investigators would consider whether the fire resulted from carelessness on the part of the staff.
He said investigators were considering the possibility that it was an inside job.
But investigators considered the allegation without merit and never pursued it.
For years, investigators considered both the brother and the tutor to be suspects.
Young asked the company doctor if the investigators had considered thallium poisoning.
Because of the thick vegetation at the site, investigators consider that there are probably more to be found.
With no solid area from which to start recovery efforts, investigators and local officials considered several options.
Immediately following its production in 1940, early investigators considered it to be a metal.