Using the remove() method

usingTheRemoveMethod.as

/* Retrieve the _id property from a document returned by mongodb. */
var objectId:ObjectID = documentRetrievedFromMongo._id;

/* Create a selector query using the Document object to specify by _id
which document to remove() */
var selector:Document = new Document();
selector.put("_id", objectId);

/* Call the remove function, there is no return. */
mongo.db("myDatabase").collection("myCollection").remove(selector);

/* Use the getLastError command like with the insert() to check for success. */
mongo.db("myDatabase").runCommand(new Document("getLastError:")).addOnce(onLastError);

function onLastError(opReply:OpReply):void
{
    // The command response document will be in the first element
    // of the documents Array in the OpReply object. The structure
    // of the document will depend on the command executed.
    var document:Object = opReply.documents[0];

    // The ok property should equal 1 if the remove was a success.
    if (1 == document.ok)
    {
    }
}