I have visited countries that inspect all incoming luggage for bottles that may contain alcohol, police in some countries will even frown upon someone uttering the name of the respective head of state. Showing too much affection to others may carry heavy consequences in some places, wearing too little or too much clothing is able to cause issues as well. Countries differ in detail and actions that will not even raise an eyebrow in one country will attract serious punishment in others.
But I am reasonably sure that there is no country the police forces of which will not take interest in suspicions of homicide. What, then, is a consulate to do? There is no such thing as a get-out-of-jail card stapled to ones passport, a sovereign nation must retain the right to punish malefactors on its territory. But what the consulate, company or the pilot union can do is provide a translator, help in picking a suitable local attorney and possibly have a representative sit in the audience at court. Some attention from outsiders may well cause the court to show the stern, but more importantly merciful face of its countries justice to the world. Maybe an exchange of prisoners can be arranged for, although this system has been misused by some countries in the past for political reasons - certainly, serving ones time in ones home country is preferrable to rotting in the slammer somewhere else. Or the sentence could include a deportation after having served some time. Some options are there, but still the best among those is to steer clear of anything illegal as much as possible...