Have another beloved character kill them. Better be a close friend to the character, one that absolutely no one suspect, one that everyone can't help but love. One who is always enthusiastic and encourages your character.
THEN:• Reveal the truth only when it's too late and the killer escapes.
• Have a cowardly character know the truth and never tell anyone.
• Have another character discover the truth but die before telling anyone else.
• Have the said character^ not actually die, but go through something that they forget the friend of the deceased is actually an asshole.
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Twix's Writing Tips: Volume 1
RandomFor this book: 30 ways to make a character's death sadder.