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.
An appositive is a phrase, usually a noun phrase, that renames another phrase or noun. A noun phrase is a group of words taking the job of a noun in a sentence. Noun phrases consist of the main noun and any modifiers. For example, 'yellow house', 'high school teacher', and 'the large dog' are all noun phrases. Here is an example of a sentence using a one word appositive to rename another noun.