Having trouble unloading an external SWF in AS3

I am able to load an external swf just fine by using the code shown below. Once the external swf has completed playing (it's like a 10 second clip) I would like to unload it automatically. Any help would be greatly appreciated. I'm a flash noob so please be very clear, thank you so much.

var myLoader:Loader = new Loader()
addChild(myLoader);
var url:URLRequest = new URLRequest("clippromo.swf"); 
myLoader.load(url);

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