I with I knew more about this incident, but this is a poorly written article.
Here is a blog with a lot of links and additional information:
Officer Barnes Questions/ Criticizes Officer Torres Shooting John Geer
Here is a recent protest held by concerned citizens in the Fairfax area:
Facebook-organized Protesters in Fairfax Demand Justice for John Geer
And here is a Twitter page: #justiceforjohngeer