John was born in 1796. supposedly in Dublin, Ireland.
Sir John William Jeffcott was the first judge of the Supreme Court of South Australia. He had also served as Chief Justice of Sierra Leone from the 26th of April 1830 to 1833 before he returned to England and accepted his knighthood. After overcoming legal trouble in England after a duel left his opponent mortally wounded, he accepted the appointment as the first judge of the new colony of South Australia on the 27th of May 1836.
So in September 1836 Sir John William Jeffcott travelled to the Australian colonies, on the Isabella in the company of J. B. Hack and family. Arriving in Hobart, Van Diemen's Land on the 1st of January 1837. Here he became engaged to marry his cousin Anne Kermode. He then proceeded to Adelaide, South Australia, arriving there on 21 April 1837.
Nearing the end of 1837, Jeffcott joined an expedition to explore the Murray Mouth. He unfortunately drowned on the 12th of December 1837 when the overloaded whaleboat in which he was a passenger overturned in rough seas of Encounter Bay. His body was never found.
From the South Australian Gazette and Colonial Register newspaper of Saturday 6 January 1838 we see a report on the accident:
J > Jeffcott > John William Jeffcott
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