/**
 * _deleteObject function
 * Removes the specified object from the parent object and nulls the object.
 *
 * @param obj:Object The specific object to remove
 */
private function _deleteObject(obj:Object):void
{
    if (obj.parent)
        obj.parent.removeChild(obj);
    obj = null;
}

This function will delete and object and mark it for deletion with gc.

ActionScript 3 Delete an Object Function

object, actionscript

ActionScript 3