
This should be: "Mary, whom I knew when I worked at Microsoft, and whose husband died a year ago, now lives in Boston."

I agree with the missing comma, but not the use of the "and." There is no absolute need for it.

The first adjectival phrase could be omitted resulting in:
Mary, whose husband died a year ago, now lives in Boston.
Hence the "and" is not needed.

Removing the added comma after "Mary."
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added by DostKaplan, September 3, 2016
edited by DostKaplan, September 3, 2016
edited by DostKaplan, September 3, 2016
linked by guni, October 2, 2016