Locked room double murder
<p>Consider a hypothetical room with in it two murder victims. Two people are both suspects of both murders. There is overwhelming evidence to show that the victims were not killed by the same person. It can also be proven that no one besides the two suspects could possibly have commited the murders.</p>

<p>We can deduce logically that both suspects committed precisely one murder, but we don't know who killed who.</p>

<p>Can the suspects be found guilty of murder?</p>

<h2>Yes</h2>
<p>Now, murder needs a definition because they are all subtly different. Let’s use the one in the <a href="/questions/tagged/new-south-wales" class="post-tag" title="show questions tagged &#39;new-south-wales&#39;" aria-label="show questions tagged &#39;new-south-wales&#39;" rel="tag" aria-labelledby="new-south-wales-container">new-south-wales</a> Crimes Act 1900:</p>
<blockquote>
<p>Murder shall be taken to have been committed where the act of the accused, or thing by him or her omitted to be done, causing the death charged, was done or omitted with reckless indifference to human life, or with intent to kill or inflict grievous bodily harm upon some person, or done in an attempt to commit, or during or immediately after the commission, by the accused, or some accomplice with him or her, of a crime punishable by imprisonment for life or for 25 years.</p>
</blockquote>
<p>The only real difficulty is in the phrase “causing the death charged”. So a sensible prosecutor would charge both defendants with both deaths. A jury would find them guilty beyond reasonable doubt of one of the “death[s] charged”.</p>
<p>The case is similar to <a href="https://www.abc.net.au/news/2016-09-02/roger-rogerson-and-glen-mcnamara-jailed-jamie-gao-murder/7808336" rel="nofollow noreferrer">Rogerson and McNamara</a> who took a live Jamie Gao into a storeroom and came out with a body. Each accused the other of the murder - the jury didn’t believe either of them.</p>

murder hypothetical