On this day in conspiracies

The Los Angeles Examiner identifies the victim as Elizabeth Short via fingerprints wired to the FBI; press coverage soon nicknames her the 'Black Dahlia.'

The panel finds no direct physical threat but flags an indirect one: the volume of reports could overload air-defense communications and be exploited for psychological purposes. Its report recommends a public education campaign to reduce the mystery around sightings and the monitoring of civilian UFO groups.

Lumumba and two associates, Maurice Mpolo and Joseph Okito, are flown to Katanga, beaten, and shot by a firing squad commanded by Belgian officers, in the presence of Katangan officials. Their bodies are later dug up and destroyed to prevent a grave becoming a shrine.

After scouring roughly 120,000 square kilometres of seabed without success, Malaysia, Australia and China suspend the underwater search.

Navalny flies back to Russia and is detained at Moscow's Sheremetyevo airport on arrival. He is subsequently imprisoned; over the following years further convictions on fraud and extremism charges, which he and his supporters call fabricated, extend his sentence to 19 years.

Kensington Palace announces that the Princess of Wales underwent planned abdominal surgery at The London Clinic, that the procedure was successful, and that she is expected to remain in hospital for up to 10–14 days and not to resume public duties until after Easter. The palace says the condition is non-cancerous and asks that her medical details stay private.