Amanda Knox Released:

Who?
Amanda Knox and the Italian government and judicial system.
What?
Amanda Knox was convicted of killing her roomate. Then she was set free after she appealed her conviction. 
Where?
The trial, appeal, and supposed murder all occured in Italy.
When?
She was released on October 4th, 2011.
Why?
She appealed her conviction and then the reconsidered her verdict. 
How?
Knox took advantage of every legal opprotunity available to her.