kjlm The Korean Journal of Laboratory Medicine Korean J Leg Med 2383-5702 2383-5710 The Korean Society for Legal Medicine 10.7580/kjlm.2014.38.3.121 kjlm-38-121 Original Article A Case of Dyadic Death Associated with Helium Gas: An Autopsy Case Report HaHongil 1 LimSeung 2 KimJeong Mok 2 ParkSohyung 3 YangKyung Moo 3 KimSeong Ho 4 KimYu Hoon 4 Division of Forensic Medicine, Busan Institute, National Forensic Service, Yangsan, Korea Scientific Investigation Division, Gyeongnam Provincial Police Agency, Changwon, Korea Medical Examiner's Office, National Forensic Service, Wonju, Korea Daejeon Institute, National Forensic Service, Daejeon, Korea 책임저자: 하홍일(626-742) 경상남도 양산시 물금읍 금오로 50, 국립과학수사연구원 부산과학수사연구소 법의학과전화: +82-55-380-4050 FAX: +82-55-380-4060 E-mail: sanchee@korea.kr 02 2014 04 02 2014 38 3 121 125 01082014 19082014 25082014 Copyright © 2014 The Korean Society for Legal Medicine 2014 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract

A 39-year-old man, his 35-year-old wife, and their 13-year-old daughter were found dead in their home. The man and his daughter were found lying in her bedroom, with his head wrapped in a plastic bag connected to four helium gas cylinders by green polypropylene tubes. Fragments of the burnt ignition briquette were found in the bucket located at her feet. His wife was found in a decomposed state lying on her right side in her bedroom. Autopsy findings for the man were unremarkable except for cherry pink lividity; the blood carboxyhemoglobin concentration was 73%. Autopsy findings were unremarkable for the woman as well, except for a few petechial hemorrhages and conjunctival congestion. The daughter showed no definite abnormalities; howev-er, her blood and lung contained helium gas. The deceased man's suicide note, evidence gathered at the scene, and postmortem examination revealed that this was a case of dyadic death.

 Asphyxia Autopsy Helium Homicide-Suicide References Ogden RD Wooten RH Asphyxial suicide with helium and a plastic bag Am J Forensic Med Pathol 2002 23 2347 Humphry D Final exit: the practicalities of self deliverance and assisted suicide for the dying 3rd ed. New York Dell Publishing 2002 Lim HS Hahm KW Kang HW Observation of 17 asphyxial suicides by helium gas Korean J Leg Med 2013 37 7883 Milroy CM The epidemiology of homicide-suicide (dyadic death) Forensic Sci Int 1995 71 11722 Ogden RD Observation of two suicide by helium inhalation in prefilled environment Am J Forensic Med Pathol 2010 31 15661 Auwaerter V Perdekamp MG Kempf J, Toxicological analysis after asphyxial suicide with helium and a plastic bag Forensic Sci Int 2007 170 13941 Musshoff F Hagemeier L Kirschbaum K, Two cases of suicide by asphyxiation due to helium and argon Forensic Sci Int 2012 223 e2730 Liem M Homicide followed by suicide: a review Aggress Violent Behav 2010 15 15361 Figures

The man and his daughter were lying along in her bedroom, with his head wrapped in a plastic bag connected with four helium gas cylinders by green polypropylene tubes (a). Fragments of burnt ignition briquette were seen in the bucket located at his daughter's feet (b).

His wife was lying on right side and decomposed in her bedroom.