SF_14.0, SF_14.1, SF_14.2, SF_14.3 - https://www.progress.com/documentation/sitefinity-cms/work-with-content

JSSDKDeleteItems.js

function deleteNewsItem(sitefinity, id) {
    var dataOptions = {
        urlName: "newsitems",
        providerName: "OpenAccessDataProvider",
        cultureName: "en"
    }

    var data = sitefinity.data(dataOptions);

    data.destroy({
        key: id,
        successCb: function (data) {
            // data is empty - 204 http status
            console.log(data);
        },
        failureCb: function (data) {
            console.log(data);
        }
    });
}