Nowadays, you can't use implied death; too many storytellers have tricked their audiences. This is exceptionally bad in comic books, where superheroes die surprisingly often, but none of them actually stay dead. They are always resurrected or rebooted. You also have the problem with too many spy stories where a character ultimately fakes their death to be able to move around without being suspected.
Because this technique is so common, it is now cheap. It also breeds a certain mistrust amongst readers. If you haven't seen a character actually die, then they aren't actually dead. It may not be the funnest mindset to have, but it will prevent you from being played by an amateur author with cheap tricks.