This list of unsolved deaths includes well-known cases where: * The cause of death could not be officially determined. * The person's identity could not be established after they were found dead. * The cause is known, but the manner of death (homicide, suicide, accident, overdosing) could not be determined. * Different official investigations have come to different conclusions. Cases where there are unofficial alternative theories about deaths – the most common theory being that the death was a homicide – can be found under: Death conspiracy theories.