There are many sad and untimely deaths each year and in most cases the cause of death is tragically clear. But in others, things may not always be as they seem. Cause of Death: Unknown explores cases where the circumstances of death may initially appear to be one thing but the investigation ultimately reveals something quite different. Each episode follows a multi-layered investigation in which police officers, investigators and scientists have worked together to unravel the truth. The investigating teams retell the stories of the discoveries that cracked the case – illustrated with recreations and original evidence including forensics results and scene photos. Interviews with friends and family remind us of the human tragedy behind each headline and give a moving testament to the sense of loss felt by those left behind.