tournament_accidental_death_effect

tournament_accidental_death_effect = {
	scope:activity = {
		if = {
			limit = { exists = scope:accident_killer }
			add_activity_log_entry = {
				key = tournament_accident_killer_log
				tags = { contestant death bad }
				score = 25
				character = scope:accident_victim
				target = scope:accident_killer
			}
			scope:accident_victim = {
				death = {
					death_reason = death_contest_melee_accident
					killer = scope:accident_killer
				}
			}
		}	
		else = {
			add_activity_log_entry = {
				key = tournament_accident_log
				tags = { contestant death bad }
				score = 25
				character = scope:accident_victim
			}
			scope:accident_victim = {
				death = { death_reason = death_contest_melee_accident }
			}
		}
		every_attending_character = {
			if = {
				limit = {
					OR = {
						has_any_scripted_relation = scope:accident_victim
						is_close_family_of = scope:accident_victim
						is_consort_of = scope:accident_victim
						AND = {
							this = scope:accident_victim.liege
							tier_difference = {
								target = scope:accident_victim
								value <= 1
							}
						}
						liege = scope:accident_victim
					}
				}
				trigger_event = tournament_events.0701
			}
			else = {
				send_interface_message = {
					type = event_death_bad
					title = tournament_accident_death_msg_title
					left_icon = scope:accident_victim
					show_as_tooltip = {
						if = {
							limit = { exists = scope:accident_killer }
							scope:accident_victim = {
								death = {
									death_reason = death_contest_melee_accident
									killer = scope:accident_killer
								}
							}
						}
						else = {
							scope:accident_victim = {
								death = { death_reason = death_contest_melee_accident }
							}
						}
					}
				}
			}
		}
		# For making sure there are not obscene numbers of accidents
		if = {
			limit = { exists = var:accident_death_count }
			change_variable = {
				name = accident_death_count
				add = 1
			}
		}
		else = {
			set_variable = {
				name = accident_death_count
				value = 1
			}
		}
	}
}

As written in game/common/scripted_effects/04_dlc_ep2_tournament_effects.txt.