Mr. Samuel Fitch 'married in 1650-51, Mrs. Mary Whiting, widow of the "Worshipful Mr. William Whiting," ... who had died while in London on business in 1647.'
'Samuel [Fitch/Ffitch],m.Mrs,Mary Whyting,[ ],1650'
The name of Mary appears to be an error, as several other secondary sources (including Torrey) identify her name as Susanna.