The Walking Dead: Torn Apart - Episodes 1 - 6

In The Walking Dead's Season 1 episode "Days Gone Bye," sheriff's deputy Rick Grimes encounters a badly decayed female walker lying beside a bicycle in a park. Later, he returns to mercifully shoot the walker in the head. Who was this woman? How did she become a walker? [...] [Source: AMC Blog]

Here are all six parts to the web-series, the series is geoblocked but if you search youtube you can find non-geoblocked videos of each of the six parts.