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British movie, possibly 1960s, where man marries rich widows then murders them.

The sister of a victim helps solve the crime by renting a room, I think.
asked Feb 21, 2015 in Name That Movie by photoshopper (11 points)
Maybe "Shadow of a Doubt"? http://www.imdb.com/title/tt0036342/

1 Answer

 
Best answer
After trying to find the answer for months, I sleuthed more intensely and found the answer after I posted this.... Cast a Dark Shadow with Dirk Bogarde. Thanks tho!
answered Feb 22, 2015 by photoshopper (11 points)
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