murder_consequences_known_or_exposed_hidden_opinion_effect

murder_consequences_known_or_exposed_hidden_opinion_effect = {
	$MURDERER$ = {
		###ADD TRAITS###
		#Force tooltip is used for everyone but POV to make sure expose secret events looks right for everyone, even though the trait can only be added once. Kinslayer works the same way.
		add_trait_only_force_tooltip_if_not_pov_effect = { TRAIT = murderer POV = $POV$ }
		add_kinslayer_trait_or_nothing_effect = { VICTIM = $VICTIM$ }
		
		if = { #Add piety penalty if the murder was unjust
			limit = {
				NOR = {
					any_close_family_member = {
						even_if_dead = yes
						killer ?= $VICTIM$
					}
					any_spouse = {
						even_if_dead = yes
						killer ?= $VICTIM$
					}
					AND = {
						rite = { rite_has_parameter = sanctioned_assassinations } #this checks that assassins don't get piety loss for killing unbelievers
						NOT = { faith = $VICTIM$.faith }
					}
				}		
			}
			add_piety = medium_piety_loss
		}

		# Family Feud
		house_feud_murder_effect = { VICTIM = $VICTIM$ MURDERER = $MURDERER$ }

		###OPINION AND DREAD###
		#Hide this from POV if they're not the murderer
		if = {
			limit = { this = $POV$ }
			add_dread = 15
			hidden_effect = {
				murder_opinion_effect = { VICTIM = $VICTIM$ MURDERER = $MURDERER$ }
			}
		}
		else = {
			hidden_effect = {
				add_dread = 15
				murder_opinion_effect = { VICTIM = $VICTIM$ MURDERER = $MURDERER$ }
			}
		}
		# There are some things you just shouldn't do
		show_as_tooltip = {
			if = {
				limit = { $VICTIM$ = { has_character_flag = is_party_baron } }
				add_character_modifier = {
					modifier = party_baron_murdered_the_joy_of_life_modifier
				}
			}
		}
		hidden_effect = {
			if = {
				limit = {
					OR = {
						exists = local_var:murdered_party_baron
						exists = scope:secret.var:murdered_party_baron
					}
				}
				add_character_modifier = {
					modifier = party_baron_murdered_the_joy_of_life_modifier
				}
			}
		}
	}

	# Struggle Catalysts.
	if = {
		limit = {
			$VICTIM$ = { is_vip_struggle_character = yes }
			$MURDERER$ = {
				any_character_struggle = {
					involvement = involved
					activate_struggle_catalyst_secondary_character_involvement_involved_trigger = {
						CATALYST = catalyst_discovery_of_very_important_murder
						CHAR = $VICTIM$
					}
				}
			}
		}
		$MURDERER$ = {
			every_character_struggle = {
				involvement = involved
				limit = {
					activate_struggle_catalyst_secondary_character_involvement_involved_trigger = {
						CATALYST = catalyst_discovery_of_very_important_murder
						CHAR = $VICTIM$
					}
				}
				activate_struggle_catalyst = {
					catalyst = catalyst_discovery_of_very_important_murder
					character = $MURDERER$
				}
			}
		}
	}
}

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