Watch The Fatal Wedding Full Movie Free Online 123Movies. The hero, Howard, has just married his sweetheart Mabel. Howard's ex-flame Cora remains in love with Howard, but she despises Mabel. With the help of her old acquaintance Robert, Cora breaks up Howard and Mabel's marriage. On the verge of wedding Howard herself, Cora is exposed for the viper that she is by the careless Robert.