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 = singular, appendices = plural). Appendices are used when the incorporation of material in the body of the work would make it poorly structured or too long and detailed. The appendix may be used for helpful, supporting or essential material that would otherwise clutter, break up or be distracting to the text. Other people's work will be referred to, not quoted, in the appendix. Appendices may include some of the following: