What is the irony in and what is the best meaning of Brutus' dying statement,
Farewell, good Strato-Caesar, now be still; I killed not thee with half so good a will. (5.5.55-57)
The statement is an example of verbal irony because of the underlying sarcastic tone Brutus has in the last line when he speaks to the ghost of Caesar and expresses the thought that killing himself is for a better reason than having killed Caesar.
This statement is an example of situational irony since the audience was not expecting Brutus to kill himself; rather Brutus was intended to be a strong character who would fight to his death in the battle for the good of Rome.
This statement is an example of dramatic irony because the audience doesn't expect the death of Brutus to parallel to the death of Caesar. Both of them reference one another before their final breath and both are in a state of dismay due to the circumstances of their deaths.
This quote is an example of situational irony because the audience can infer that Caesar's ghost would be the ultimate cause for Brutus to commit suicide; the overwhelming guilt Brutus felt upon his realization that Caesar's death was a poor choice and the appearance of the ghost served as a constant reminder of Brutus' actions.