The relations of the murdered or injured man to his assailant, so far as they may reasonably be treated as explanatory of the conduct of the accused as charged in the indictment, are properly admitted to proof as integral parts of the history of the alleged crime for which the accused is on his trial. [2]
In this statement "the conduct of the accused" of which the relationship of the parties may be explanatory will not necessarily be limited to the act charged, as in this case, the act of shooting, but will extend, in my opinion, to any act of the accused the proof of which is itself relevant to the question whether the accused in fact did the act charged. Here the question was whether the deceased fired the gun. If he did, no other question remained. The relations of the parties, in my opinion, may be relevant to that fact. In R. v. Barbour [3] evidence of quarrels which were no more than "transient ebullitions of annoyance and anger on the part of the accused which immediately passed away and led to nothing" and which did not proceed from hostility or enmity nor tended to show the existence of or to promote such feelings were ruled inadmissible. Sir Lyman Duff C.J. said:
If you have acts seriously tending, when reasonably viewed, to establish motive for the commission of a crime, then there can be no doubt that such evidence is admissible, not merely to prove intent, but to prove the fact as well. But I think, with the greatest possible respect, it is rather important that the courts should not slip into a habit of admitting evidence which reasonably viewed cannot tend to prove motive or to explain the acts charged merely because it discloses some incident in the history of the relations of the parties. [4]
If the words "or to explain the acts charged", which are to be found in the latter part of this quotation were inserted as they may well have been intended to be, after the word "motive" in the earlier part of the statement, I would respectfully agree with what the learned Chief Justice said: but otherwise I am unable to accept the limitation on the admissibility of the evidence which the learned Chief Justice's words if not so expanded would seem to imply. Here the question is not whether a motive or some particular intent can be found or assigned for or in connexion with a killing but of choosing between the competing views in point of fact of accidental discharge of the gun and its discharge by the act of the accused.
1. [1906] 2 K.B., at p. 401.
2. [1939] 1 D.L.R. 65, at p. 66.
3. [1939] 1 D.L.R., at p. 67.