To destroy a sprite or image that has been added to the DGM, simply call the destroy function and pass it the sprite/image variable.
//define the gameCanvas using the HTML canvas element var gameCanvas = dgm.setupCanvas(document.getElementById("gameCanvas")); //setup a wooden block object to be destroyed var woodenBlock_data = { "id": "wooden_block", "x": 0, "y": 0, "src": 'images/wooden-block.png' }; //add the wooden block object to the canvas var woodenBlock = dgm.configImg(woodenBlock_data, gameCanvas); //after 5 seconds, destroy the block setTimeout(function() { dgm.destroy(woodenBlock); }, 5000);