His preserved body was exhumed in 1984 , to try to determine the cause of death .
John Hartnell ( 1820 -- 4 January 1846 ) was an English sailor , and part of Sir John Franklin 's last expedition .
John Hartnell 's preserved body was exhumed in 1984 , to try to determine the cause of death .
John Hartnell ( 1820 -- 4 January 1846 ) was an English sailor , and part of Sir John Franklin 's last expedition .