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.
Definition of 'append'. append (Épend ) When you append something to something else, especially a piece of writing, you attach it or add it to the end of it. Violet appended a note at the end of the letter. It was a relief that his real name hadn't been appended to the manuscript.