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.
A collection of supplementary materials, usually appearing at the end of a report, proposal, or book. Plural: appendixes or appendices. An appendix typically includes data and supporting documents used by the writer to develop the report. Though such information should be of potential use to the reader (not treated as an opportunity for padding), it would disrupt the flow of the argument if included in the main body of the text.