[1] In 1841, at the insistence of his cousin the 3rd Baron Ventry, he assumed the surname De Moleyns in lieu of his patronymic.
[1] In 1854, he was prosecuted at the City of London Police Court for forging a signature to a power of attorney with intent to defraud the Bank of England of £1,500.
He protested his innocence but lacking funds to defend himself he was committed to Newgate Prison where he died suddenly, a week later, at the age of 49.
His heir, a nephew, refused to inherit because he did not want to accept the conditions of changing his own surname to De Moleyns and living for one in every four years in County Kerry.
Under the will the money passed to University College, London for purpose of endowing a professorship in electrical science.