This obituary for a Warren F Hastings appeared in the Dallas Morning News in 2005.
According to a posting on the Nobiliana Forum, this was mentioned here on Peerage News at the time, but I cannot find it. Perhaps the archive doed not go that far back?
At any rate, he was apparently identified at the time as the Warren Francis Hastings who was next heir but one to the Earl of Huntingdon. The obituary does show that the deceased was born in Melbourne on 30 April 1938, which matches Warren Francis Hastings' date of birth.
There are some anomalies: the deceased is called a descendant of the colonialist Warren Hastings, who is not known to be connected to the Huntingdons. The only survivors mentioned are a wife, Margaret, and a daughter, Kathryn, along with a sister, Leonie Thompson.
Warren Francis Hastings did have a sister named Leonie, but the most recent Debrett's I have is the 2011 edition, where he is shown as living, with no 4th wife named Margaret and no daughter Kathryn. His known children by his third marriage, who are in Debrett's, are not mentioned inthe obituary.
Does anyone know for sure whether the deceased is the Warren Francis Hastings of the earls of Huntingdon? Do more recent Debrett's editions shed any more light on this?