This week, a new documentary about photographer Vivian Maier opened in Chicago. She's the Chicago nanny who was also a secret photographer, and who many now believe is one of the great street photographers of the 20th century. Jay Shefsky first introduced us to Vivian Maier in December 2010. We revisit his original story.

In part two of our series on photographer Vivian Maier, we meet other owners of her remarkable archive and explore the international explosion of interest in her work.

Vivian Maier

We take another look at a Chicago Tonight story that went "viral" on YouTube and won us an Emmy. Vivian Maier was the Chicago nanny who took more than a hundred thousand photos during her lifetime -- but never showed them to anyone. After her death, her photos were discovered, and many now say she ranks among the top street photographers of the 20th century.