known_murder_hidden_opinion_effect

known_murder_hidden_opinion_effect = {
	$VICTIM$ = { save_scope_as = victim_scope }
	$MURDERER$ = { save_scope_as = murderer_scope }
	hidden_effect = {
		if = {
			limit = { $VICTIM$ = { has_character_flag = is_party_baron } }
			set_local_variable = {
				name = murdered_party_baron
				value = yes
			}
		}
	}
	$VICTIM$ = {
		every_close_family_member = {
			limit = {
				NOR = {
					this = $MURDERER$
					is_scheming_against = {
						target = $VICTIM$
						type = murder
					}
					has_any_bad_relationship_with_character_trigger = { CHARACTER = $VICTIM$ }
					trigger_if = {
						limit = { exists = scope:scheme }
						scope:scheme = { scheme_is_character_agent = prev }
					}
				}
				opinion = {
					target = $VICTIM$
					value > -50
				}
			}
			hidden_effect = {
				random = {
					chance = 25
					modifier = {
			            factor = 2
			            has_trait = wrathful
			        }
			        modifier = {
			            factor = 2
			            has_trait = vengeful
			        }
			        modifier = {
			            factor = 2
			            has_any_good_relationship_with_character_trigger = { CHARACTER = $VICTIM$ }
			        }
			        modifier = {
			        	factor = 2
			        	OR = {
			        		is_parent_of = $VICTIM$
			        		is_child_of = $VICTIM$
			        	} 	
			        }
				    trigger_event = {
						id = bp1_yearly.8050
						days = 15
					}
				}
			}
		}
		death = {
			death_reason = death_murder
			killer = $MURDERER$
		}
		hidden_effect = { set_killer_public = yes }
	}
	$MURDERER$ = {
		hidden_effect = {
			add_secret = {
				type = secret_murder
				target = $VICTIM$
			}
			random_secret = {
				type = secret_murder
				limit = {
					secret_target = $VICTIM$
				}

				set_variable = {
					name = known_murder
					value = yes
				}

				expose_secret = $EXPOSER$
			}
		}
	}
	show_as_tooltip = {
		murder_consequences_known_or_exposed_hidden_opinion_effect = {
			MURDERER = $MURDERER$
			VICTIM = $VICTIM$
			POV = root
		}
	}
	# Family Feud
	house_feud_murder_effect = { VICTIM = $VICTIM$ MURDERER = $MURDERER$ }
}

As written in game/common/scripted_effects/00_murder_effects.txt.