This list includes important cases of unsolved deaths. Some cases have other ideas about how the person died, but these are not official. The most common idea is that the death was caused by someone else. These cases are listed in: Death conspiracy theories.

Unsolved deaths

• The Younger Lady (25–35) is the informal name for a mummy of a woman who lived during the Eighteenth Dynasty of Egypt (c. 1549 to 1292 BCE). She was discovered in the Egyptian Valley of the Kings in tomb KV35 by archaeologist Victor Loret in 1898. The cause of her death is unknown. Recent DNA tests have shown that this mummy is the mother of the pharaoh Tutankhamun and a daughter of pharaoh Amenhotep III and Queen Tiye. Early ideas that these were the remains of Queen Nefertiti have been proven incorrect.
• Tutankhamun (18–19), a male Egyptian pharaoh, is believed to have died around 1323 BCE. His cause of death is unknown, though one theory suggests he was fatally injured in a chariot crash.
• Zoroaster (76) was an ancient male Iranian prophet who lived around 1000 BCE. He was said to have performed miracles and founded the religion now known as Zoroastrianism. His cause of death is unknown. Some say he was killed by invading Turanians, but this has never been confirmed.
• The Hasanlu Lovers are the remains of two people found in Teppe Hasanlu, Iran, in 1972. They are thought to have died around 800 BCE. While some believe they died from asphyxiation, no definite cause of death has been determined.
• The Borremose bodies are three bog bodies found in 1946 and 1948 in Himmerland, Denmark, in the Borremose peat bog. They lived during the Nordic Bronze Age (770 BCE). Their causes of death are unknown.
• The Saltmen are the remains of six men who lived during the Achaemenid dynasty (550–330 BCE). They were discovered in 2010 in salt mines in Chehrabad, Iran. Most were accidentally killed by collapsing tunnels, but the causes of death for the others are unknown.
• Alexander the Great (32) died in 323 BCE after a short illness. The exact nature of the illness is debated, though it is known he drank heavily throughout his life.
• Orgetorix, who died in 61 BCE, was a wealthy aristocrat among the Helvetii, a Celtic-speaking people in what is now Switzerland. He was tried for planning to seize control of Gaul. His cause of death beyond this is disputed.
• Cleopatra (39), the last ruler of Ptolemaic Egypt, is believed to have died in August 30 BCE in Alexandria. Popular belief says she killed herself by letting an asp (Egyptian cobra) bite her. Greek and Roman historians suggest she poisoned herself using a toxic ointment or a sharp object like a hairpin. Accounts come mainly from ancient Roman historians Strabo, Plutarch, and Cassius Dio. Modern scholars debate whether she was murdered or if her Roman rival, Octavian, forced her to commit suicide. Cleopatra’s tomb is unknown.
• Judas Iscariot, a disciple and one of the Twelve Apostles of Jesus, died in AD 31. His death circumstances vary by source, though many say he committed suicide by hanging.
• The Weerdinge Men were two bog bodies found in Drenthe, Netherlands, in 1904. One man is known to have been murdered, but the cause of the other’s death is unknown. They died between 160 BCE and 220 CE.
• Windeby I (16) is the name given to a bog body found in 1952 in Northern Germany. It contains the remains of a teenage male who lived between 41 BCE and 118 CE. His cause of death is disputed and unknown.
• Princess Yongtai (15–16), 701. Historical records in the Old Book of Tang and New Book of Tang state she was executed by Empress Wu Zetian with her brother and husband for spreading rumors about two officials. Her epitaph mentions she was pregnant at death. A pelvic bone suggests she may have died from childbirth, as her pelvis appears smaller than other women of her age. It is also suspected she died from a fatal miscarriage after learning her brother and husband were executed.
• Emperor Taizu of Song (49), the first emperor of the Song dynasty, died in 976. No records explain how he died. His younger brother became emperor because Taizu had two grown sons. A folk story called "shadows by the candle and sounds from an axe" suggests he may have been murdered by his brother or committed suicide.
• Roopkund is a high-altitude glacial lake in Uttarakhand, India, near the Himalayas. It is known for hundreds of ancient human skeletons found at its edge. Research suggests a group of people were killed in a sudden hailstorm in the 9th century. Older skeletons date to the 9th century CE, while a second group dates to the 19th century CE. The identities of the skeletons are unknown, but radiocarbon dating indicates the older remains were spread over time, while the younger group was deposited during a single event.
• King William II of England (43–44), 1100, was killed by an arrow while hunting. It is unclear whether this was an accident.
• Agnès Sorel (28), 1450, was Charles VII of France’s chief royal mistress and had four daughters with him. She fell ill during pregnancy with their fourth daughter and died on 9 February 1450. The cause of her death is disputed.
• The Lovers of Cluj-Napoca (30s) are two skeletons found in a former Dominican convent in Romania in 2013. They are believed to have lived between 1450 and 1550. Their exact causes of death are unclear.
• Henry Holland, 3rd Duke of Exeter (45), a Lancastrian, died after falling overboard and drowning in the English Channel in September 1475. Theories about his death exist, but none have been proven.
• Regiomontanus (40), whose real name was "Johannes Müller von Königsberg," was an astrologer, mathematician, and astronomer of the German Renaissance. He is thought to have died from the plague on 6 July 1476, though

Date of death disputed

Johann Georg Faust, a German alchemist and astrologer, was reportedly killed in an explosion in 1540 or 1541. People believed he died in an accident related to alchemy. However, the exact cause of the accident is unknown, and his body was described as "badly injured," which led to questions about possible crime or even involvement by supernatural forces.

Raoul Wallenberg, a Swedish diplomat who worked in Budapest, Hungary, was likely executed in the Soviet Union in or around 1947 after being captured by the Red Army in 1945. Soviet officials recorded his death as happening on July 16, 1947, but this date is disputed, and the case has not been solved.

Hans Kammler, a Nazi engineer and SS commander, was last seen in 1945. In 1948, a court officially declared that he had died by suicide on May 9, 1945, based on reports from people who claimed to have seen him. However, questions remain about the timing and details of his death.