The door through which Oscar Pistorius fatally shot his girlfriend, Reeva Steenkamp, is used as evidence during &amp;lt;a href=&amp;quot;http://www.cnn.com/2014/03/03/africa/gallery/pistorius-2014-trial/index.html&amp;quot;&amp;gt;his murder trial&amp;lt;/a&amp;gt; Monday, April 14, in Pretoria, South Africa. Pistorius, the first double amputee runner to compete in the Olympics, is accused of intentionally killing Steenkamp in February 2013. He has pleaded not guilty to murder and three weapons charges.