or even more generic approach
var oTable = sap.ui.getCore().byId("tableId");
var selectedContexts = oTable.getSelectedContexts(true);
var oModel = oTable.getModel();
var dataNode = oModel.getData()["DATA_NODE"];
$.each(selectedContexts.reverse(), function (i, item) {
var i = parseInt(item.getPath().substr(item.getPath().lastIndexOf("/") + 1));
dataNode.splice(i, 1);
});
oModel.refresh(true);
DATA_NODE is the name of attribute bound to items of table