In two films about the Titanic, Murdoch was portrayed shooting passengers and himself during the sinking; this was based on a number of eyewitness testimonies of a shooting/suicide by an officer during the launching of the last lifeboat. It is possible that Murdoch was the officer.
In general, to append is to join or add on to the end of something. For example, an appendix is a section appended (added to the end) of a document. In computer programming, append is the name of a procedure for concatenating (linked) lists or arrays in some high-level programming languages.
appendix (plural appendices or appendixes) ( 1 obsolete in general sense) Something attached to something else; an attachment or accompaniment. 2  Specifically, a text added to the end of a book or an article, containing information that is important to but is not the main idea of the main text.