Henry G. Green.

Henry G. Green was infatuated with Mary Ann Wyatt, leading lady of a troupe of temperance players who performed in Berlin, New York in 1844. When the troupe left Berlin, Henry followed and was soon courting Mary Ann. On February 10, 1845, they were married. Eight days after that Mary Ann Wyatt Green was dead from arsenic poisoning.  

There is little doubt Henry Green murdered his wife but his motive in doing so is an enduring mystery.

Read the full story: The Murdered Wife.