Wonder if the death would also be registered in the UK.
This is a year difference in the birth year out but is this possible ?
There should be a report of a UK citizen who died in the USA unless that's why the Consulate is listed on that death above.
UK Death Registration

?
Malcolm Maclemhan (Maclellan) Smith - 16 October 1903 - 1977 (aged 73 years)
Registration Date Jan 1977 - Feb 1977 - Mar 1977
Registration Quarter Jan-Feb-Mar Surrey South Western
Volume 17 Page 1482
Added :- another to discount.
Maybe not this chap - he received a UK, World War II Civil Defence Gallantry Awards, 1940-1949 - 6 Holbin Mews, Sloane Square. SW1
Was a police constable for a year but occupation was a wine butler.