New York Times, page 1, 8 December 1885:
Havana, Dec 7 - Miss Susan Morse, a daughter of Samuel F. B. Morse, inventor of the telegraph, while en route to this place on the Spanish mail steamer, disappeared shortly before arrival of the vessel. It is supposed she threw herself into the sea in a temporary fit of mental aberration.
Her obituary is in the New York Times 9 December 1885 page 8.
Prof. Sam'l. F. B. & Lucretia P. Morse
Widow of Edward Lind
Porto Rico West Indies
Born Sept. 2, 1819
Lost at sea off the coast of Cuba
December 1, 1885
Nor forgotten shall be our cherished one
Though she sleeps in the watery waste alone.