Hi Adrienne , just back on this site after a while away. I found the burial of Jane as Jean Murray , buried in the Douglas Borough Cemetery January 7 , 1971 aged 71. I checked with a friend who has the Memorial Inscriptions for most of the cemeteries on the IOM. She advises : DBC NC134 In Loving Memory of Jean MURRAY Who died 3rd January 1971 , aged 71 years Beloved wife of the late Francis MURRAY of Dublin Who died 3rd December, 1937 , aged 38 years R.I.P.
So this must be your Jane , obviously whoever arranged the headstone would have been close family to know the details of Francis' death.
The Manx BMD site has informtion (I think) to 1979 , there are no marriages for Katherine , or deaths for any of the Five children.
Most sites on genealogy concentrate up to about 1920 , so it is hard to track down later dates.
The Manx Telecom site has phone numbers for the initials of all the male Murrays , as well as the phone number it has addresses , so perhaps you could send a note.