secret_murder_is_trivial_trigger

secret_murder_is_trivial_trigger = {
	#Is the murderer important enough to get away with it?
	$OWNER$ = { highest_held_title_tier >= tier_county }
	#Is it a murder that people might care about?
	OR = {
		#Independent rulers have little fear in terms of legal consequences for their actions.
		$OWNER$ = { top_liege = this }
		#Otherwise, certain victims are just not worth a strong hook.
		$TARGET$ = {
			NOR = {
				#If landless or a baron, must have no important landed family.
				AND = {
					OR = {
						is_ruler = no
						highest_held_title_tier = tier_barony
					}
					any_close_or_extended_family_member = { highest_held_title_tier >= $OWNER$.primary_title.tier }
				}
				#Otherwise, characters who are two tiers lower than you arguably aren't nearly as much of a concern (again, providing they lack important family).
				AND = {
					tier_difference = {
						target = $OWNER$
						value >= -1
					}
					#Be a bit harsher with this, as these characters are the most likely to be relatives of the $OWNER$'s piers.
					any_close_or_extended_family_member = {
						tier_difference = {
							target = $OWNER$
							value >= -1
						}
					}
				}
			}
		}
	}
}

As written in game/common/scripted_triggers/00_secret_type_triggers.txt.